Drop support for Julia versions <1.0 (#665)

* Bump required Julia version to 1.0

* Remove compatibility support code for:
  * `at-__MODULE__` (from #363)
  * `devnull`, `stdin`, `stdout`, and `stderr` from #499
  * `at-nospecialize` (from #385 and #409)
  * `isabstracttype` and `isconcretetype` (from #477)
  * `invokelatest` from #424
  * array-like access to `Cmd` from #379
  * `Val(n)` and `ntuple`/`reshape` with `Val` from #381 and #399
  * `logdet(::Any)` fallback from #382
  * `chol(::UniformScaling)` from #382
  * `pushfirst!`, `popfirst!` from #444
  * `fieldcount` from #386
  * `read(obj, ::Type{String})` from #385 and #580
  * `InexactError`, `DomainError`, and `OverflowError` constructors from #393
  * `corrected` kw arg to `cov` from #401
  * `adjoint` from #401
  * `partialsort` from #401
  * `pairs` from #428
  * `AbstractRange` from #400
  * `rtoldefault` from #401
  * `Dates.Period` rounding from #462
  * `IterativeEigensolvers` from #435
  * `occursin` from #520
  * `Char` concatenation from #406
  * `BitSet` from #407
  * `diagm` and `spdiagm` with pairs from #408
  * `Array` c'tors from `UniformScaling` from #412 and #438
  * `IOContext` ctor taking pairs from #427
  * `undef` from #417 and #514
  * `get` on `ENV` from #430
  * `ComplexF...` from #431
  * `tr` from #614
  * `textwidth` from #644
  * `isnumeric` from #543
  * `AbstractDict` from #435
  * `axes` #435 and #442
  * `Nothing` and `Cvoid` from #435
  * `Compat.SuiteSparse` from #435
  * `invpermute!` from #445
  * `replace` with a pair from #445
  * `copyto!` from #448
  * `contains` from #452
  * `CartesianIndices` and `LinearIndices` from #446, #455, and #524
  * `findall` from #466 (and #467).
  * `argmin` and `argmax` from #470, #472, and #622
  * `parentmodule` from #461
  * `codeunits` from #474
  * `nameof` from #471
  * `GC` from #477
  * `AbstractDisplay` from #482
  * `bytesavailable` from #483
  * `firstindex` and `lastindex` from #480 and #494
  * `printstyled` from #481
  * `hasmethod` from #486
  * `objectid` from #486
  * `Compat.find*` from #484 and #513
  * `repr` and `showable` from #497
  * `Compat.names` from #493 and #505
  * `Compat.round` and friends #500, #530, and #537
  * `IOBuffer` from #501 and #504
  * `range` with kw args and `LinRange` from #511
  * `cp` and `mv` from #512
  * `indexin` from #515
  * `isuppercase` and friends from #516
  * `dims` and `init` kwargs from #518, #528, #590, #592, and #613
  * `selectdim` from #522 and #531
  * `repeat` from #625
  * `fetch(::Task)` from #549
  * `isletter` from #542
  * `isbitstype` from #560
  * `at-cfunction` from #553 and #566
  * `codeunit` and `thisind` and friends from #573
  * `something` from #562
  * `permutedims` from #582
  * `atan` from #574
  * `split` and `rsplit` from #572
  * `mapslices` from #588
  * `floatmin` and `floatmax` from #607
  * `dropdims` from #618
  * required keyword arguments from #586
  * `CartesianRange` in `at-compat` from #377
  * `finalizer` from #416
  * `readline`, `eachline`, and `readuntil` from #477, #541, and #575
  * curried `isequal`, `==`, and `in` from #517
  * `Some` from #435 and #563
  * `at-warn` and friends from #458

* Remove old deprecations

* Deprecate:
  * `Compat.Sockets` from #545 and #594
  * `TypeUtils` from #304
  * `macros_have_sourceloc` from #355
  * `Compat.Sys` from #380, #433, and #552
  * `Compat.MathConstants` from #401
  * `Compat.Test`, `Compat.SharedArrays`, `Compat.Mmap`, and `Compat.DelimitedFiles` from #404
  * `Compat.Dates` from #413
  * `Compat.Libdl` from #465 (and #467)
  * `AbstractDateTime` from #443
  * `Compat.Printf` from #435
  * `Compat.LinearAlgebra` from #463
  * `Compat.SparseArrays` from #459
  * `Compat.Random` from #460, #601, and #647
  * `Compat.Markdown` from #492
  * `Compat.REPL` from #469
  * `Compat.Serialization` from #473
  * `Compat.Statistics` from #583
  * `Fix2` from #517
  * `Compat.Base64` from #418
  * `Compat.Unicode` from #432 and #507
  * `notnothing` from #435 and #563
  * `Compat.IteratorSize` and `Compat.IteratorEltype` from #451
  * `enable_debug(::Bool)` from #458
  * `Compat.Distributed` from #477
  * `Compat.Pkg` from #485
  * `Compat.InteractiveUtils` from #485
  * `Compat.LibGit2` from #487
  * `Compat.UUIDs` from #490
  * `Compat.qr` from #534
  * `Compat.rmul!` from #546
  * `Compat.norm` abd friends from #577

* Remove obsolete README entry, missed in #385

* Remove obsolete tests (e.g. missed in #372)

* Remove obsolete `VERSION` conditionals and some minor clean-up

.travis.yml

@@ -3,11 +3,10 @@ os:
     - linux
     - osx
 julia:
-    - 0.6
-    - 0.7
     - 1.0
     - 1.1
     - 1.2
+    - 1.3
     - nightly
 notifications:
   email: false

Project.toml

@@ -27,4 +27,4 @@ UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
-julia = "0.6,0.7,1"
+julia = "1"

appveyor.yml

@@ -1,10 +1,9 @@
 environment:
   matrix:
-  - julia_version: 0.6
-  - julia_version: 0.7
   - julia_version: 1.0
   - julia_version: 1.1
   - julia_version: 1.2
+  - julia_version: 1.3
   - julia_version: latest
 
 platform: