Bump to version 1.5.1 (pyro-ppl#2698)

* Bump to version 1.5.1

* Bump torch version in docs, add instructions

Bump version to 1.5.0 (pyro-ppl#2671)

* Add script to update version

* Bump version_prefix

* Fix script

* Bump version

Bump to version 1.4.0 (pyro-ppl#2565)

Bump to version 1.3.1 (pyro-ppl#2400)

Bump version to 1.3.0 (pyro-ppl#2352)

* Include neutra example in tutorials

* Fix link

* Bump version to 1.3.0

Release patch to fix mcmc parallel chains using multiprocessing (pyro…

…-ppl#2275)

Bump version to 1.2.0 (pyro-ppl#2267)

Bump to version 1.1.0 (pyro-ppl#2215)

Bump version to 1.0.0 (pyro-ppl#2171)

Bump version to 0.5.1 that is python 3.5 compatible (pyro-ppl#2089)

* Bump version to 0.5.1 that is python 3.5 compatible

* more fixes to setup.py

* update minimum python version to 3.5

* address comments

* fix tqdm issue

* bump up pyro-api version