Add license scan report and status

[fossabot]

Your FOSSA integration was successful! Attached in this PR is a badge and license report to track scan status in your README.

Below are docs for integrating FOSSA license checks into your CI:

• CircleCI
• TravisCI
• Jenkins
• Other

[codecov]

Codecov Report

Merging #69 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #69   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files           6        6           
  Lines         438      438           
  Branches       69       69           
=======================================
  Hits          433      433           
  Misses          5        5

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