fix(deps): remove high severity vulnerability and add extra travis check on PRS
The only exception is `webpack-svgstore-plugin` that still points to some older package versions with `low` severity vulnerabilities and apparently the repo is not active that [the actual fix](https://github.com/mrsum/webpack-svgstore-plugin/pull/172) could be merged. Because of that I'm limiting the scope to just `high` severity issues. Note: I decided to include `audit-ci` because `yarn` does not provide (yet) a way to filter violations by severity level. fix(deps): upgrade packages so that `yarn lint` works with the current babel-eslint
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