Remove dead examples directory from flake8 invocation. (#914)

diff --git a/tox.ini b/tox.ini
index 19e6567..bdda806 100644
--- a/tox.ini
+++ b/tox.ini
@@ -56,7 +56,7 @@
      flake8
 skip_install = true
 commands =
-     flake8 src tests examples setup.py
+     flake8 src tests setup.py
 
 [testenv:pypi-readme]
 deps =