Merge pull request explosion#3434 from Bharat123rox/narrow-unicode

Raise Error for a narrow unicode build of Python

Set version to 2.1.0

Set version to v2.1.0a13

Update push-tag script

Set version to v2.1.0a11

Set version to v2.1.0a10

Merge branch 'develop' of https://github.com/explosion/spaCy into dev…

…elop

Set version to v2.1.0a9.dev0

Set version to v2.1.0a8

Set version to v2.1.0a7