Add py37 support

Author: vtitor

.travis.yml

@@ -6,6 +6,7 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
+  - "3.7"
 
 # command to run tests
 script: python setup.py test

setup.py

@@ -21,6 +21,7 @@
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
         "Topic :: Software Development :: Libraries",
         "Topic :: Text Processing",
     ],