Add E211.

test/normalizer_issue_files/E21.py

@@ -0,0 +1,16 @@
+#: E211:4
+spam (1)
+#: E211:4 E211:19
+dict ['key'] = list [index]
+#: E211:11
+dict['key'] ['subkey'] = list[index]
+# Okay
+spam(1)
+dict['key'] = list[index]
+
+
+# This is not prohibited by PEP8, but avoid it.
+# Dave: I think this is extremely stupid. Use the same convention everywhere.
+#: E211:9
+class Foo (Bar, Baz):
+    pass