Fix Readme broken link

[johannpinson]

A little commit for changing two links into the README :+1:

[codecov[bot]]

Codecov Report

Merging #39 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   85.06%   85.06%           
=======================================
  Files           6        6           
  Lines         154      154           
  Branches       31       31           
=======================================
  Hits          131      131           
  Misses         22       22           
  Partials        1        1

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[SpaceK33z]

Thanks!