Show setup.py specified dependencies in PR text

[moorepants]

The automatic PR when PyPi updates is great. One thing that you always have to check is whether the dependencies have changed in the new release. It would be convenient if the PR on the feedstock displayed the dependency specifications from the package's setup.py file and showed the dependencies from the feedstock recipe. This would allow the person merging to quickly see if more work is needed to update the recipe to match the setup.py file.

[CJ-Wright]

I think this is somewhat related to #132

[jakirkham]

Also issue ( #22 ). Though that would just push those changes for you.