add Mozilla Public License Version 2.0

[adrianosela]

Need License to get into https://github.com/avelino/awesome-go

• Follow the PR: add sops (mozilla-services/sops) avelino/awesome-go#2603

[codecov-io]

Codecov Report

Merging #488 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #488   +/-   ##
========================================
  Coverage    36.44%   36.44%           
========================================
  Files           20       20           
  Lines         2760     2760           
========================================
  Hits          1006     1006           
  Misses        1662     1662           
  Partials        92       92

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