Enhancement: Add MIT

[localheinz]

This PR

• adds the MIT license type

[codecov]

Codecov Report

Merging #38 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #38      +/-   ##
============================================
+ Coverage     98.73%   98.92%   +0.19%     
- Complexity       53       58       +5     
============================================
  Files            13       14       +1     
  Lines           158      186      +28     
============================================
+ Hits            156      184      +28     
  Misses            2        2

Impacted Files	Coverage Δ	Complexity Δ
src/Type/MIT.php	100% <100%> (ø)	5 <5> (?)

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