MNT: Disallow pyproj 2.0.0
MNT: Disallow pyproj 2.0.0

This has completely busted us.

jrleeman/MetPy,Unidata/MetPy,ahaberlie/MetPy,ahaberlie/MetPy,jrleeman/MetPy,ShawnMurd/MetPy,Unidata/MetPy,dopplershift/MetPy,dopplershift/MetPy