Update setup.py

Bump PySyft version to v0.2.6 (OpenMined#3604)

* Update `syft-proto` dependency to v0.4.5

* Bump PySyft version to `v0.2.6`

* Appease the style checkers

Bump version to `v0.2.5` (OpenMined#3451)

Bump version to v0.2.4 (OpenMined#3219)

Bump version from `0.2.3a3` to `0.2.3` (now w/ stable deps) (OpenMine…

…d#3125)

Bump version to `v0.2.3a3` (OpenMined#3110)

Version/v0.2.3.a2 (OpenMined#3089)

* Remove `docs/conf.py` from `bumpversion` files

* Bump version to `v0.2.3.a2`

Bump version to `0.2.3.a1` (OpenMined#2976)

Bump version to 0.2.2a1 (OpenMined#2943)