Deprecation dependencies warnings

[rtritto]

Summary

karma-coverage, dependency of videojs-generate-karma-config, contains istanbul dependency that is a deprecated library.

To solve, update karma-coverage to latest version.

Steps to Reproduce

1. yarn init -y
2. yarn add videojs-generate-karma-config
3. See yarn log

Results

Actual

yarn log:

...
warning videojs-generate-karma-config > karma-coverage > [email protected]: This module is no longer maintained, try this instead:
  npm i nyc
Visit https://istanbul.js.org/integrations for other alternatives.
...

Expect

No warning in yarn log.