remove duplicate entry and alphabetize classifier list.

Author: ikirudennis

setup.py

@@ -42,13 +42,12 @@ def get_version():
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Topic :: Software Development :: Libraries :: Python Modules',
-        'Programming Language :: Python',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Topic :: Software Development :: Libraries :: Python Modules',
     ],
     keywords='textile,text,html markup',
     install_requires=[