refactor: add identity as key name.

[appleboy]

fix #152
fix #155

[codecov-io]

Codecov Report

Merging #156 into master will increase coverage by 0.96%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
+ Coverage   94.98%   95.95%   +0.96%     
==========================================
  Files           1        1              
  Lines         319      321       +2     
==========================================
+ Hits          303      308       +5     
+ Misses         11        9       -2     
+ Partials        5        4       -1

Impacted Files	Coverage Δ
auth_jwt.go	95.95% <100%> (+0.96%)	⬆️

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