[js] Upgrade eslint to version 7.0.0

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ eslint (^6.0.0 → ^7.0.0) · Repo · Changelog

Release Notes

7.0.0

More info than we can show here.

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

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[codecov]

Codecov Report

Merging #118 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           34        34           
=========================================
  Hits            34        34           

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