MNT: Fix python 3-ism that snuck into conf.py
MNT: Fix python 3-ism that snuck into conf.py

Oops.

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