fix(parser): support ssh://git@ protocol

[linrongbin16]

Regression Test

Platforms

• windows
• macOS
• linux

Tasks

• Use GitLink to copy git link.
• Use GitLink! to open git link in browser.
• Use GitLink blame to copy the /blame git link.
• Use GitLink! blame to open the /blame git link in browser.
• Copy git link in a symlink directory of git repo.
• Copy git link in an un-pushed git branch, and receive an expected error.
• Copy git link in a pushed git branch but edited file, and receive a warning says the git link could be wrong.

[linrongbin16]

relate: #114

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (1236865) 79.97% compared to head (eee2d83) 77.25%.

Files	Patch %	Lines
lua/gitlinker/linker.lua	85.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
- Coverage   79.97%   77.25%   -2.73%     
==========================================
  Files          12       12              
  Lines         854      844      -10     
==========================================
- Hits          683      652      -31     
- Misses        171      192      +21     

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