import categories  # nopep8
import plugins  # nopep8
import submitted_plugins  # nopep8
import tags  # nopep8

import categories  # NOQA: F401
import plugins  # NOQA: F401
import submitted_plugins  # NOQA: F401
import tags  # NOQA: F401

Update nopep8 instructions to NOQA
Update nopep8 instructions to NOQA

`flake8` seems to have dropped support for `# nopep8` in the 3.x
versions (confirmed by testing with latest and `<3`). This causes our
style checking tests to fail.

Replace these with `# NOQA` and pin them to the specific error we care
about here (F401 unused import).
