merge cmd

[ozankasikci]

• add merge commend
• update: src/commands/merge/mod.rs
• rename merge command to merge-pr-github
• update: src/commands/merge_pr_github/mod.rs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.09%. Comparing base (6c4ef8b) to head (23df9f8).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   92.75%   93.09%   +0.33%     
==========================================
  Files           9        9              
  Lines        1877     1969      +92     
==========================================
+ Hits         1741     1833      +92     
  Misses        136      136              

Flag	Coverage Δ
unit	93.09% <100.00%> (+0.33%)	⬆️

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