fix codecov link shorcuts

[kpicaza]

Closes issue pheature-flags/pheature-flags#85

[codecov-io]

Codecov Report

Merging #7 (4f1af37) into 1.0.x (53454db) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              1.0.x       #7   +/-   ##
=========================================
  Coverage     21.81%   21.81%           
  Complexity       49       49           
=========================================
  Files            11       11           
  Lines           110      110           
=========================================
  Hits             24       24           
  Misses           86       86           

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