Changed the get_upper_air_data function to bring in heights.
Changed the get_upper_air_data function to bring in heights.

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