Bikeshed update for 'Specify which ScrollDirections obey writing-mode/directionality

Addresses #22' [ci skip]

Generated from:

commit 31b66b2
Merge: ad5405a 1c71b27
Author: Brian Birtles <birtles@gmail.com>
Date:   Tue Oct 23 13:56:32 2018 +0900

    Merge pull request #24 from stephenmcgruer/horizontal_vertical_directions

    Specify which ScrollDirections obey writing-mode/directionality

commit 1c71b27
Author: Stephen McGruer <smcgruer@chromium.org>
Date:   Fri Oct 19 14:57:31 2018 -0400

    Specify which ScrollDirections obey writing-mode/directionality

    Addresses #22

Author: stephenmcgruer