Set version to v2.1.0a10

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

…elop

Set version to v2.1.0a8

Set version to v2.1.0a7

Set version to 2.1.0a6

Set version to v2.1.0a5

Remove unused code from spacy pretrain

Set version to v2.0.18

Fix conftest getoption

fixes symbolic link on py3 and windows (explosion#2949)

* fixes symbolic link on py3 and windows
during setup of spacy using command
python -m spacy link en_core_web_sm en
closes explosion#2948

* Update spacy/compat.py

Co-Authored-By: cicorias <cicorias@users.noreply.github.com>