Update devDependencies packages

[amire80]

eslint-config-wikimedia: 0.14.1 -> 0.15.3
eslint-plugin-qunit: 4.0.0 -> 4.2.0
grunt-eslint: 22.0.0 -> 23.0.0
jquery: 3.4.0 -> 3.5.1

[Nikerabbit]

Failure might be due to requiring eslint7, which no longer supports node 0.10.x. Some of the packages pull in eslint 7.1, as can be seen in package-lock.json. I think it's grunt-eslint and maybe others.

[amire80]

Mmmm... And do we need to support this version of node?

[Nikerabbit]

This isn't a node library, so no. I think it's only used for linting/testing. Latest version that Travis needs is sufficient.

[amire80]

OK, and do you know how to fix it?

[Nikerabbit]

I'd try updating https://github.com/wikimedia/jquery.i18n/blob/master/.travis.yml#L4

[amire80]

OK, done in #215

[amire80]

#215 appears to have fixed this issue, but created some others. I'm working on it.