Ensure that the license is included in the source dist

[mariusvniekerk]

[codecov-io]

Codecov Report

Merging #49 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   99.57%   99.57%           
=======================================
  Files           8        8           
  Lines         466      466           
  Branches       76       76           
=======================================
  Hits          464      464           
  Misses          1        1           
  Partials        1        1

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[mariusvniekerk]

ping @Robpol86