Prepare for 0.6.4

Author: fabaff

setup.py

@@ -19,7 +19,7 @@
 
 setup(
     name='luftdaten',
-    version='0.6.3',
+    version='0.6.4',
     description='Python API for interacting with luftdaten.info.',
     long_description=long_description,
     url='https://github.com/fabaff/python-luftdaten',
@@ -38,8 +38,8 @@
         'Operating System :: MacOS :: MacOS X',
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Topic :: Utilities',
     ],
 )