Prep for the February release (microsoft#968)

* Bump the version to 2018.2.0
* Update the changelog

Prep for 2018.1 final (microsoft#683)

* Bump version number to final

* Add release date

* Mention the cached interpreter change

Merge branch 'master' into Release-0.9.1

Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Update the TPN (microsoft#415)
  0.9.0 release details (microsoft#407)

0.8.0 release

new version

new version

updated version for new build

update version

updated version