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.

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[codecov-io]

Codecov Report

Merging #466 into master will increase coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #466      +/-   ##
==========================================
+ Coverage   74.55%   74.93%   +0.37%     
==========================================
  Files           5        5              
  Lines         794      794              
  Branches      231      231              
==========================================
+ Hits          592      595       +3     
+ Misses        147      146       -1     
+ Partials       55       53       -2

Impacted Files	Coverage Δ
tmuxp/workspacebuilder.py	90.9% <0%> (+1.81%)	⬆️

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[fossabot]

Your license scan is passing -- congrats!

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