Auto merge of #7498 - xFrednet:changelog-1-55, r=flip1995

Updated changelog for 1.55

This has again been a bit of work, but I'm happy to notice that my English is still improving, and I'm getting faster at these things. That's a very nice side effect of contributing and getting feedback on reviews 😊

Moving on, there were a few things that I was unsure about:
* The PR rust-lang/rust#86717 changes an old entry in the change log, is this worth mentioning? I've left it out for now.
* The stabilization of `cargo clippy --fix` is quite awesome and important IMO. It sadly gets a bit lost in the *Other* entry, as it's the last one. Do we maybe want to move it somewhere else or change the headline order for this release?
* I've listed the introduction of the new `suspicious` group under the *Moves and Deprecations* section. Is this alright, or should it be moved to the *Other* section as well?
* Last but definitely not least, some fun! I've used the 🎉 emoji in the `cargo clippy --fix` entry, is this okay?

Sorry for the bombardment of questions xD

---

The PR already includes the entries for the new metadata collection and website updates. These are not merged yet, but should probably be to make this correct. This might also require the commit hashes to be updated (Not sure on this, though). It would actually be super fitting to get this into this release as we also stabilize `--fix`. TODOs:
* [x] Merge metadata collection PRs:
  1. #7279
  2. #7298
  3. #7420 (Hope to not get any merge conflicts)

---

[Rendered 📰](https://github.com/xFrednet/rust-clippy/blob/changelog-1-55/CHANGELOG.md)

r? `@flip1995`

changelog: none

CHANGELOG.md

@@ -6,11 +6,141 @@ document.
 
 ## Unreleased / In Rust Nightly
 
-[3ae8faf...master](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...master)
+[74d1561...master](https://github.com/rust-lang/rust-clippy/compare/74d1561...master)
+
+## Rust 1.55
+
+Current beta, release 2021-09-09
+
+[3ae8faf...74d1561](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...74d1561)
+
+### Important Changes
+
+* Stabilized `cargo clippy --fix` :tada:
+  [#7405](https://github.com/rust-lang/rust-clippy/pull/7405)
+
+### New Lints
+
+* [`rc_mutex`]
+  [#7316](https://github.com/rust-lang/rust-clippy/pull/7316)
+* [`nonstandard_macro_braces`]
+  [#7299](https://github.com/rust-lang/rust-clippy/pull/7299)
+* [`strlen_on_c_strings`]
+  [#7243](https://github.com/rust-lang/rust-clippy/pull/7243)
+* [`self_named_constructors`]
+  [#7403](https://github.com/rust-lang/rust-clippy/pull/7403)
+* [`disallowed_script_idents`]
+  [#7400](https://github.com/rust-lang/rust-clippy/pull/7400)
+* [`disallowed_type`]
+  [#7315](https://github.com/rust-lang/rust-clippy/pull/7315)
+* [`missing_enforced_import_renames`]
+  [#7300](https://github.com/rust-lang/rust-clippy/pull/7300)
+* [`extend_with_drain`]
+  [#7270](https://github.com/rust-lang/rust-clippy/pull/7270)
+
+### Moves and Deprecations
+
+* Moved [`from_iter_instead_of_collect`] to `pedantic`
+  [#7375](https://github.com/rust-lang/rust-clippy/pull/7375)
+* Added `suspicious` as a new lint group for *code that is most likely wrong or useless*
+  [#7350](https://github.com/rust-lang/rust-clippy/pull/7350)
+  * Moved [`blanket_clippy_restriction_lints`] to `suspicious`
+  * Moved [`empty_loop`] to `suspicious`
+  * Moved [`eval_order_dependence`] to `suspicious`
+  * Moved [`float_equality_without_abs`] to `suspicious`
+  * Moved [`for_loops_over_fallibles`] to `suspicious`
+  * Moved [`misrefactored_assign_op`] to `suspicious`
+  * Moved [`mut_range_bound`] to `suspicious`
+  * Moved [`mutable_key_type`] to `suspicious`
+  * Moved [`suspicious_arithmetic_impl`] to `suspicious`
+  * Moved [`suspicious_assignment_formatting`] to `suspicious`
+  * Moved [`suspicious_else_formatting`] to `suspicious`
+  * Moved [`suspicious_map`] to `suspicious`
+  * Moved [`suspicious_op_assign_impl`] to `suspicious`
+  * Moved [`suspicious_unary_op_formatting`] to `suspicious`
+
+### Enhancements
+
+* [`while_let_on_iterator`]: Now suggests `&mut iter` inside closures
+  [#7262](https://github.com/rust-lang/rust-clippy/pull/7262)
+* [`doc_markdown`]:
+  * Now detects unbalanced ticks
+    [#7357](https://github.com/rust-lang/rust-clippy/pull/7357)
+  * Add `FreeBSD` to the default configuration as an allowed identifier
+    [#7334](https://github.com/rust-lang/rust-clippy/pull/7334)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]: Now allows wildcards for enums with unstable
+  or hidden variants
+  [#7407](https://github.com/rust-lang/rust-clippy/pull/7407)
+* [`redundant_allocation`]: Now additionally supports the `Arc<>` type
+  [#7308](https://github.com/rust-lang/rust-clippy/pull/7308)
+* [`blacklisted_name`]: Now allows blacklisted names in test code
+  [#7379](https://github.com/rust-lang/rust-clippy/pull/7379)
+* [`redundant_closure`]: Suggests `&mut` for `FnMut`
+  [#7437](https://github.com/rust-lang/rust-clippy/pull/7437)
+* [`disallowed_method`], [`disallowed_type`]: The configuration values `disallowed-method` and `disallowed-type`
+  no longer require fully qualified paths
+  [#7345](https://github.com/rust-lang/rust-clippy/pull/7345)
+* [`zst_offset`]: Fixed lint invocation after it was accidentally suppressed
+  [#7396](https://github.com/rust-lang/rust-clippy/pull/7396)
+
+### False Positive Fixes
+
+* [`default_numeric_fallback`]: No longer lints on float literals as function arguments
+  [#7446](https://github.com/rust-lang/rust-clippy/pull/7446)
+* [`use_self`]: No longer lints on type parameters
+  [#7288](https://github.com/rust-lang/rust-clippy/pull/7288)
+* [`unimplemented`]: Now ignores the `assert` and `debug_assert` macros
+  [#7439](https://github.com/rust-lang/rust-clippy/pull/7439)
+* [`branches_sharing_code`]: Now always checks for block expressions
+  [#7462](https://github.com/rust-lang/rust-clippy/pull/7462)
+* [`field_reassign_with_default`]: No longer triggers in macros
+  [#7160](https://github.com/rust-lang/rust-clippy/pull/7160)
+* [`redundant_clone`]: No longer lints on required clones for borrowed data
+  [#7346](https://github.com/rust-lang/rust-clippy/pull/7346)
+* [`default_numeric_fallback`]: No longer triggers in external macros
+  [#7325](https://github.com/rust-lang/rust-clippy/pull/7325)
+* [`needless_bool`]: No longer lints in macros
+  [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`useless_format`]: No longer triggers when additional text is being appended
+  [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`assertions_on_constants`]: `cfg!(...)` is no longer considered to be a constant
+  [#7319](https://github.com/rust-lang/rust-clippy/pull/7319)
+
+### Suggestion Fixes/Improvements
+
+* [`needless_collect`]: Now show correct lint messages for shadowed values
+  [#7289](https://github.com/rust-lang/rust-clippy/pull/7289)
+* [`wrong_pub_self_convention`]: The deprecated message now suggest the correct configuration value
+  [#7382](https://github.com/rust-lang/rust-clippy/pull/7382)
+* [`semicolon_if_nothing_returned`]: Allow missing semicolon in blocks with only one expression
+  [#7326](https://github.com/rust-lang/rust-clippy/pull/7326)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+  [#7470](https://github.com/rust-lang/rust-clippy/pull/7470)
+* [`redundant_pattern_matching`]
+  [#7471](https://github.com/rust-lang/rust-clippy/pull/7471)
+* [`modulo_one`]
+  [#7473](https://github.com/rust-lang/rust-clippy/pull/7473)
+* [`use_self`]
+  [#7428](https://github.com/rust-lang/rust-clippy/pull/7428)
+
+### Documentation Improvements
+
+* Reworked Clippy's website:
+  [#7279](https://github.com/rust-lang/rust-clippy/pull/7279)
+  [#7172](https://github.com/rust-lang/rust-clippy/issues/7172)
+  * Added applicability information about lints
+  * Added a link to jump into the implementation
+  * Improved loading times
+  * Adapted some styling
+* Clippy now uses a lint to generate its documentation
+  [#7298](https://github.com/rust-lang/rust-clippy/pull/7298)
 
 ## Rust 1.54
 
-Current beta, release 2021-07-29
+Current stable, released 2021-07-29
 
 [7c7683c...3ae8faf](https://github.com/rust-lang/rust-clippy/compare/7c7683c...3ae8faf)
 
@@ -138,7 +268,7 @@ Current beta, release 2021-07-29
 
 ## Rust 1.53
 
-Current stable, released 2021-06-17
+Released 2021-06-17
 
 [6ed6f1e...7c7683c](https://github.com/rust-lang/rust-clippy/compare/6ed6f1e...7c7683c)