Use kong instead of kingpin

[gliptak]

#1158

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.06%. Comparing base (0625a7b) to head (b7c2e68).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/saml2aws/main.go	0.00%	26 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1360      +/-   ##
==========================================
+ Coverage   28.13%   29.06%   +0.92%     
==========================================
  Files          70       70              
  Lines       12543     9665    -2878     
==========================================
- Hits         3529     2809     -720     
+ Misses       8538     6380    -2158     
  Partials      476      476              

Flag	Coverage Δ
unittests	29.06% <0.00%> (+0.92%)	⬆️

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