BUG: Fix development version numbering
BUG: Fix development version numbering

By using "dirty-tag", it disables the +gHASH part of the version, which
leads to our development versions appearing as a non-local version to
pooch. This can lead to development snapshots trying to download from
non-existent versions instead of master.

dopplershift/MetPy,Unidata/MetPy,Unidata/MetPy,dopplershift/MetPy