Support babel 7 about babel-plugin-tailcall-optimization HOT 9 CLOSED

I've tried to upgrade the plugin to babel 7. Tests still pass. See https://github.com/mfila/babel-plugin-tailcall-optimization/tree/babel7.

All it takes has been:

1. removing old packages
2. installing new ones (replacing babel-preset-es2015 with babel-preset-env, and moving babel-core from peerDependencies to devDependencies)
3. upgrading to @babel namespace in a couple of places

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@mfila, yeah thanks that looks good!

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Please let me know of I can help with something about that.

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@xtuc is there a nice migration guide somewhere? or could you point me to another not-so-complicated plugin that start supporting babel@7 so i can take a closer look at diff? Thanks :)

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We have http://babeljs.io/blog/2017/03/01/upgrade-to-babel-7-for-tool-authors but it's not really up-to-date.

I would suggest you using https://github.com/babel/babel-upgrade.

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@mfila shieeet, nice :D Do you want to make a PR? to alternative branch like next? I can get this published.

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@krzkaczor yes... an alternative branch would be great, thanks!

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I've updated my branch to use Babel 7 beta.56 before making the PR

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@mfila thanks so much for your contribution!

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