Add AppVeyor badge
Add AppVeyor badge
ShawnMurd/MetPy,ahill818/MetPy,deeplycloudy/MetPy,ahaberlie/MetPy,Unidata/MetPy,dopplershift/MetPy,ahaberlie/MetPy,Unidata/MetPy,dopplershift/MetPy,jrleeman/MetPy,jrleeman/MetPy