Disable the use of @babel/transform-runtime (solves #111)

[edorivai]

As described in #111, the upgrade to 1.9.0 introduces a dependency on @babel/runtime without marking it a (peer)dependency.

This setup works well for projects that already have @babel/runtime@^7 set up, but for those that do not, we will break their build.

The purpose of @babel/transform-runtime is to reuse duplicate pieces of transpiled code, so now that I've removed it, the bundle sizes have increased. The only alternative I can think of is to make @babel/runtime a dependency. This would be a no-op in case a project already depends on it, and it would guarantee that this packages works "out-of-the-box". However, in case a project isn't using @babel/runtime yet, we would introduce the entire babel runtime into their bundle, even though we only use a portion of it.

@mjackson I'd love to hear your take on this (and that of anyone else for that matter). However, if there's no response here after some time I'll just go ahead and publish this 😄

[mjackson]

Yes, we should have @babel/runtime as a dependency. I forgot to include it. The @babel/transform-runtime plugin ensures that we only include the pieces of @babel/runtime that we need so that we don't include the whole thing.

[edorivai]

Ah ok, even better then 👍