Log Message:
sayaka: pull an upstream fix for monochrome screen support.

Bump PKGREVISION.
Twitter filterstream timeline on Sun3/60 running NetBSD/sun3 9.0_RC1 by
sayaka was demonstrated on NetBSD booth at Open Source Conference 2020 Osaka.
 https://mail-index.netbsd.org/netbsd-advocacy/2020/01/28/msg000823.html