replace buble with babel, update deps

[dima-takoy-zz]

This PR is a part of changesets described here #213 (comment)

[dima-takoy-zz]

Should I create another PR where I update dependencies?

Can I update those inside this PR?

[lukastaegert]

Can I update those inside this PR?

Definitely!

[lukastaegert]

I wonder if we should actually add something like babel-preset-env and the target version of Node 6? Then we can easily update to Node 8 in the future once the time has come and provide the best output possible while maintaining compatibility. What do you think?

[dima-takoy-zz]

After those changes, I think we can rewrite sources to async-await syntax. It will be compiled to promises by babel then we just change target version to 8 ;)

I already have a branch with refactored this package to async-await syntax. Should I send a PR?

[lukastaegert]

Sounds good! I assume it will also work for the tests via babel-register?

[dima-takoy-zz]

Sounds good! I assume it will also work for the tests via babel-register?

I think yes. It already works with it.

current mocha opts(with this PR):

--require @babel/register

[dima-takoy-zz]

SHould I add refactored to async-await version to this PR?

[lukastaegert]

SHould I add refactored to async-await version to this PR?

Sure, sounds good, considering you already seem to have done the work. Just avoid utils/promisify for the Node 6 compatibility.

[dima-takoy-zz]

I prefer to merge this PR as is. Then I add PR with refactored to async-await syntax.