Add --skip-open-browser flag

[int128]

This will add --skip-open-browser flag.

[codecov-commenter]

Codecov Report

Merging #92 into master will decrease coverage by 1.67%.
The diff coverage is 81.48%.

@@            Coverage Diff             @@
##           master      #92      +/-   ##
==========================================
- Coverage   84.84%   83.17%   -1.68%     
==========================================
  Files           1        1              
  Lines          99      107       +8     
==========================================
+ Hits           84       89       +5     
- Misses          9       10       +1     
- Partials        6        8       +2     

Impacted Files	Coverage Δ
pkg/authproxy/auth_proxy.go	83.17% <81.48%> (-1.68%)	⬇️

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