Conda 4.5 is out

The changelogs don't seem to introduce any new major feature, so I think we should update our setup to accommodate its use. @amohammadi: any fears at this point?

Did we hard code these urls? https://github.com/conda/conda/pull/6887

This is true in our before_build.sh. It may be also true on certain environment files attached to publications. TBC.

mentioned in merge request !83 (merged)

closed via commit 5af59fa2

closed via merge request !83 (merged)