Explicitly define ST4 selector

[rchl]

I think I don't need to include source.js.react since it should be matched by source.js but haven't verified that.

Fixes #60

[rwols]

I say drop the ST3 compatibility :D but you do you.

[rchl]

I'm having doubts about this change now...

I imagine that there is a group of people who are using the flow (source.js.flow) syntax for all *.js files (since it shouldn't break anything for plain JS files) and just disable LSP-typescript in flow-only projects. With this change that flow would break as the server would no longer work in non-flow projects...

I say drop the ST3 compatibility :D but you do you.

I'm not dropping ST3 compat unless there is a good reason for it. :)
And then I'd fork a tag for ST3 to not break it but just leave unmaintained.

[alecmev]

My situation is certainly exotic, so I'm happy either way, but a quick google search shows that "source.js.flow" doesn't really exist in the wild. As an example, Naomi marks it as source.flow instead.

[rchl]

To avoid potentially breaking change, decided to not exclude flow. Only defined the selector to make it more obvious for people wanting to change it.

How to handle "flow" better should instead go to the readme. You are welcome to submit a PR for it @alecmev