feat: support opening the first HTTP reference in browser (#11)

[mertssmnoglu]

Description of change

Users will now be able to open CVE reference URL's directly in their browsers via pressing Space (#11)

Add new Pattern to handling the Space character. If user pressed the Space key on the details, look for all references starting with 'http' and open the first URL in the web browser if available.

New Dependency

Add webbrowser dependency to open browser on cross platform. 1026380

How has this been tested?

🟢 Run all tests

running 3 tests
test error::tests::test_error ... ok
test widgets::tests::test_selectable_list ... ok
test args::tests::test_args ... ok

Manual Test Cases

CVE has no references | (1/3)

• Expected Behaviour: Do nothing
• Test CVE: CVE-1999-0020

• I tested this case and it works as expected.

---

CVE has reference without any http URL | (2/3)

• Expected Behaviour: Do nothing
• Test CVE: CVE-1999-0044

• I tested this case and it works as expected.

---

CVE has reference with http URL | (3/3)

• Expected Behaviour: Open web browser with given URL
• Test CVE: CVE-1999-0116

• I tested this case and it works as expected.

---

Known Linter Warnings

warning: used `unwrap()` on an `Option` value
  --> src/handler.rs:43:35
   |
43 |                 let references = &app.list.selected().unwrap().references;
   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: if this value is `None`, it will panic
   = help: consider using `expect()` to provide a better panic message
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_used

This is my first rust experience. Please feel free to tell me if you see anything wrong in this PR.

[orhun]

Thank you for the PR! It looks good to me overall. Just had one comment about refactoring.

Also, can you update README.md about this new key binding?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 8.14%. Comparing base (f9a94ea) to head (050a56b).
Report is 3 commits behind head on main.

Files	Patch %	Lines
src/handler.rs	0.00%	11 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##            main     #15      +/-   ##
========================================
- Coverage   8.27%   8.14%   -0.13%     
========================================
  Files         13      13              
  Lines        701     712      +11     
========================================
  Hits          58      58              
- Misses       643     654      +11     

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[mertssmnoglu]

Thank you for the PR! It looks good to me overall. Just had one comment about refactoring.

Also, can you update README.md about this new key binding?

I got your changes with fixings.
Currently I'm not into writing a user guide for this change. I think the owner of the repo(you) will describe your project better than me.

[orhun]

We can continue with this PR. You can simply update the key bindings table to mention this new functionality and I think that will be enough.

[mertssmnoglu]

We can continue with this PR. You can simply update the key bindings table to mention this new functionality and I think that will be enough.

I couldn't see available key bindings table in README.md so I add a new table. #20

[orhun]

Oops, I thought I added it 😅 Thanks for the PR!