Bumped go-oauth2/oauth2 to 4.4.3

[vgarvardt]

Fixes #21

[codecov-commenter]

Codecov Report

Merging #22 (4c2dff5) into master (09f56b8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   83.00%   83.00%           
=======================================
  Files           4        4           
  Lines         153      153           
=======================================
  Hits          127      127           
  Misses         13       13           
  Partials       13       13           

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