Add F821 to ignore list.

- Consider removing this once names like `cmake` and `configure` are moved to a sensible namespace.

Add F821 to ignore list.
c90ecc68 · Todd Gamblin · 1a563c2b · c90ecc68
Commit c90ecc68 authored 8 years ago by Todd Gamblin
--- a/flake8.ini
+++ b/flake8.ini
 [flake8]
-ignore = W391,F403,E221
+ignore = W391,F403,E221,F821
 max-line-length = 79