Update Python versions

Author: ojarva

.travis.yml

@@ -3,7 +3,6 @@ python:
   - "2.7"
   - "3.4"
   - "3.5"
-  - "3.5-dev"
   - "3.6"
   - "3.6-dev"
   - "3.7-dev"

setup.py

@@ -25,13 +25,12 @@
         'Topic :: Security',
         'License :: OSI Approved :: BSD License',
 
-        '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 :: Implementation :: PyPy',
     ],
     keywords='ssh pubkey public key openssh ssh-rsa ssh-dss ssh-ed25519',