Bump version to PATCH release 2.1.1
Bump version to PATCH release 2.1.1

Release Notes:
* Fix v1 being the default version installed when not specifying version

Change-Id: I8271cbadec84facacb6265eb310b26d6d558dbf2

actions-on-google/actions-on-google-nodejs,actions-on-google/actions-on-google-nodejs,actions-on-google/actions-on-google-nodejs