maintner/maintnerd: add additional GitHub projects to "go" config
maintner/maintnerd: add additional GitHub projects to "go" config

Update golang/go#18517

Change-Id: Icdc131236092f15c51effafa71329e280979a0ef
Reviewed-on: https://go-review.googlesource.com/93135
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build