change license to MIT

[sshin23]

change license from MPL to MIT

[codecov]

Codecov Report

Merging #79 (9aec7b1) into master (2b29ed8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #79   +/-   ##
=======================================
  Coverage   87.33%   87.33%           
=======================================
  Files          28       28           
  Lines        3182     3182           
=======================================
  Hits         2779     2779           
  Misses        403      403           

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