CLIENT_ID is no longer required for CognitoAuth

[mochipon]

fixes #64

[codecov]

Codecov Report

Merging #65 (a68260b) into main (2e5f1b7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   92.96%   92.97%   +0.01%     
==========================================
  Files          10       10              
  Lines         625      626       +1     
==========================================
+ Hits          581      582       +1     
  Misses         44       44              

Impacted Files	Coverage Δ
pysesame3/auth.py	88.31% <100.00%> (ø)
pysesame3/const.py	100.00% <100.00%> (ø)

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