fix: move the check for Authenticator to login handler.

[appleboy]

fix #63

cc @dhdresser @djensen47

[codecov-io]

Codecov Report

Merging #69 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   96.31%   96.34%   +0.02%     
==========================================
  Files           1        1              
  Lines         163      164       +1     
==========================================
+ Hits          157      158       +1     
  Misses          4        4              
  Partials        2        2

Impacted Files	Coverage Δ
auth_jwt.go	96.34% <100%> (+0.02%)	⬆️

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