fixed classifier for LICENCE

Author: alexlib

setup.py

@@ -102,7 +102,7 @@
 
         # Miscellaneous metadata.
         'Intended Audience :: Science/Research',
-        'License :: OSI Approved :: GPLv3 License',
+        'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
         'Natural Language :: English',
         'Operating System :: OS Independent',
         'Topic :: Scientific/Engineering :: Fluid Mechanics',