Fix 'test' dependency in setup.py
Fix 'test' dependency in setup.py

It should be 'nose', not 'nosetest'.

jrleeman/MetPy,ahaberlie/MetPy,Unidata/MetPy,dopplershift/MetPy,ShawnMurd/MetPy,ahaberlie/MetPy,deeplycloudy/MetPy,ahill818/MetPy,jrleeman/MetPy,Unidata/MetPy,dopplershift/MetPy