Make an alpha release for 2.0.0

[ehmicky]

We are getting closer to releasing 2.0.0.

I am trying to use the latest commit of execa:

"dependencies": {
    "execa": "sindresorhus/execa#be1d70ffafc0d6af62d2a1af723a317e20752842",
}

However npm seems to have several issues with using commit hashes:

• some users are reporting it makes npm install fail
• it makes npm audit crash

Releasing 2.0.0-alpha.0 would solve this problem. As a side-effect, it could help us catch some bugs from early adopters before the major release.

[tunnckoCore]

Exactly what I came for today. Ship the dist tag. :) I'll use the master until then.

[ehmicky]

Fixed!