Update version to 2.1.1

[Nabellaleen]

Fix #184

• Change version in init.py
• Fix Pypi deploy on Travis

[coveralls]

Coverage remained the same at 91.899% when pulling d27f4c8 on prepare-2_1_1 into 46c9eb7 on master.

[coveralls]

Coverage remained the same at 91.899% when pulling d27f4c8 on prepare-2_1_1 into 46c9eb7 on master.

[coveralls]

Coverage remained the same at 91.899% when pulling d27f4c8 on prepare-2_1_1 into 46c9eb7 on master.

[coveralls]

Coverage remained the same at 91.899% when pulling d27f4c8 on prepare-2_1_1 into 46c9eb7 on master.

[jnak]

Looking at what Syrus usually does in other repos using Tox, the build is expected to fail when releasing on Pypi. We just need one environment to work.

https://travis-ci.org/graphql-python/graphene/builds/406016097