MNT: Clean up code for nexrad spec parser
MNT: Clean up code for nexrad spec parser

flake8 is picking up this file now, might as well make it compliant.

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