Switch to scope activationHook from language package

[Arcanemagus]

With the merging of atom/atom#17521 it should be a simple matter (once it is released) to switch the providers that activate on specific language packages to instead activate on the language they provide. This would for example allow a JavaScript provider to activate whenever source.js (or javascript) gets activated, instead of language-javascript, langugage-babel, language-.....

[Arcanemagus]

Of note:

Make sure the minimum Atom version is updated to account for the requirement of Atom v1.30.0 (or higher):

{
  # ...
  "engines": {
    "atom": ">=1.30.0 <2.0.0"
  },
  # ...
}