Fix #38: update badge

[codecov-io]

Codecov Report

Merging #39 into master will decrease coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage      49%   48.96%   -0.05%     
==========================================
  Files          38       38              
  Lines        2369     2369              
  Branches      331      331              
==========================================
- Hits         1161     1160       -1     
  Misses       1148     1148              
- Partials       60       61       +1

Impacted Files	Coverage Δ
onedrive_client/od_auth.py	53.64% <0%> (-0.67%)	:arrow_down:

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[coveralls]

Pull Request Test Coverage Report for Build 54

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 46.405%

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Totals
Change from base Build 463741802:	0.1%
Covered Lines:	1221
Relevant Lines:	2369

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💛 - Coveralls