Fix: ghes graphql endpoint error

[yanyongyu]

fix #133

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.83%. Comparing base (81c7e86) to head (b45e9f3).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #135    +/-   ##
========================================
  Coverage   17.82%   17.83%            
========================================
  Files        4834     4846    +12     
  Lines      223387   223563   +176     
========================================
+ Hits        39815    39864    +49     
- Misses     183572   183699   +127     

Flag	Coverage Δ
unittests	17.83% <100.00%> (+<0.01%)	⬆️

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