Missed updating master branch version to 1.7.1

[n2ygk]

Description of the Change

I update the changes made to master into stable/1.7 but forgot to update the version in master.
This fixes that.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #1133 (10aeeb9) into master (56c8c66) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1133   +/-   ##
=======================================
  Coverage   96.86%   96.86%           
=======================================
  Files          31       31           
  Lines        1789     1789           
=======================================
  Hits         1733     1733           
  Misses         56       56           

Impacted Files	Coverage Δ
oauth2_provider/__init__.py	100.00% <100.00%> (ø)

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[n2ygk]

Thanks @Andrew-Chen-Wang. Please approve/merge #1134 as that's blocking everything now.