Update license headers

[mfl28]

Closes #144

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.44%. Comparing base (b112f9d) to head (a9a0162).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #145      +/-   ##
============================================
- Coverage     86.47%   86.44%   -0.04%     
  Complexity     1499     1499              
============================================
  Files            97       97              
  Lines          5991     5991              
  Branches        549      549              
============================================
- Hits           5181     5179       -2     
- Misses          532      533       +1     
- Partials        278      279       +1     

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