Add test for readme

tests/readme_test.py

diff --git a/tests/readme_test.py b/tests/readme_test.py
new file mode 100644
index 0000000..d479d42
--- /dev/null
+++ b/tests/readme_test.py
@@ -0,0 +1,13 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+import io
+
+import yaml
+
+
+def test_readme_contains_all_hooks():
+    readme_contents = io.open('README.md').read()
+    hooks = yaml.load(io.open('hooks.yaml').read())
+    for hook in hooks:
+        assert '`{0}`'.format(hook['id']) in readme_contents