Increment minimum pyflakes requirement

setup.py

diff --git a/setup.py b/setup.py
index 9e7acd4..e470373 100755
--- a/setup.py
+++ b/setup.py
@@ -34,5 +34,5 @@
         keywords='clean,automatic,unused,import',
         py_modules=['autoflake'],
         scripts=['autoflake'],
-        install_requires=['pyflakes>=0.6.1'],
+        install_requires=['pyflakes>=0.7.2'],
         test_suite='test_autoflake')

tox.ini

diff --git a/tox.ini b/tox.ini
index e823fd1..456e87e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,4 +7,4 @@
     {envpython} test_acid.py test_acid.py
     {envpython} autoflake autoflake
 deps=
-    pyflakes>=0.6.1
+    pyflakes>=0.7.2