Update versions (#303)

* Python 3.7 is supported (#273)

* Update classifiers

Author: hugovk

README.rst

@@ -9,7 +9,7 @@ parsing the source file, not importing it, so it is safe to use on
 modules with side effects.  It's also much faster.
 
 It is `available on PyPI <https://pypi.python.org/pypi/pyflakes>`_
-and it supports all active versions of Python: 2.7 and 3.4 to 3.6.
+and it supports all active versions of Python: 2.7 and 3.4 to 3.7.
 
 
 
@@ -32,7 +32,7 @@ Useful tips:
 
 * If you require more options and more flexibility, you could give a
   look to Flake8_ too.
-  
+
 
 Design Principles
 -----------------

setup.py

@@ -57,6 +57,7 @@ def get_long_description():
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Software Development",