Travis: drop python2.7

Author: ojarva

.travis.yml

@@ -1,11 +1,9 @@
 language: python
 python:
-  - "2.7"
   - "3.4"
   - "3.5"
   - "3.6"
-  - "3.6-dev"
-  - "3.7-dev"
+  - "3.7"
   - "nightly"
 install:
   - pip install -r requirements.txt

setup.py

@@ -22,7 +22,6 @@
         'Intended Audience :: System Administrators',
         'Topic :: Security',
         'License :: OSI Approved :: BSD License',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',