doc/contrib.html: add Go 1.10 to release list
doc/contrib.html: add Go 1.10 to release list

Apparently we maintain this list by hand (for example, CL 52351).

Change-Id: I0a0b346cf2b7b547729cb1d0fa1642de447f7bba
Reviewed-on: https://go-review.googlesource.com/78117
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

codestation/go,golang/go,golang/go,CAFxX/go,Cofyc/go,josharian/go,codestation/go,CAFxX/go,Cofyc/go,codestation/go,golang/go,akutz/go,Cofyc/go,codestation/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,Cofyc/go,CAFxX/go,josharian/go,akutz/go,golang/go,golang/go,akutz/go,golang/go,nawawi/go,nawawi/go,christopher-henderson/Go,cloudflare/go,akutz/go,josharian/go,akutz/go,nawawi/go,CAFxX/go,golang/go,josharian/go,Cofyc/go,josharian/go,Cofyc/go,codestation/go,nawawi/go,Cofyc/go,codestation/go,cloudflare/go,CAFxX/go,golang/go,josharian/go,CAFxX/go,cloudflare/go,codestation/go,akutz/go,cloudflare/go,josharian/go,Cofyc/go,josharian/go,akutz/go,nawawi/go,cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,codestation/go,akutz/go,CAFxX/go