Update python versions, remove 2.6 and old 3.x, added 3.7 and 3.8.

Author: zoofood

setup.py

@@ -40,14 +40,13 @@ def read(fname):
         License :: OSI Approved :: MIT License
         Operating System :: OS Independent
         Programming Language :: Python :: 2
-        Programming Language :: Python :: 2.6
         Programming Language :: Python :: 2.7
         Programming Language :: Python :: 3
-        Programming Language :: Python :: 3.2
-        Programming Language :: Python :: 3.3
         Programming Language :: Python :: 3.4
         Programming Language :: Python :: 3.5
         Programming Language :: Python :: 3.6
+        Programming Language :: Python :: 3.7
+        Programming Language :: Python :: 3.8
         Programming Language :: Python :: Implementation :: PyPy
         Programming Language :: Python :: Implementation :: CPython
         Topic :: Software Development :: Libraries :: Python Modules