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

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/eggjs/egg/5D2pz1DE2ZmZpKx9VZUo7vyxvdun
✅ Preview: Failed

[codecov]

Codecov Report

Merging #4880 (282a568) into master (cea4942) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #4880   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines         1132      1132           
  Branches       188       188           
=========================================
  Hits          1132      1132           

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[fossabot]

Your license scan is passing -- congrats!

Your badge status is now updated and ready to merge: