[x/blog] x/blog: credit Renee on gopher illustration
[x/blog] x/blog: credit Renee on gopher illustration

TBR=r
R=r, reneefrench
CC=golang-codereviews
https://golang.org/cl/171460043
X-Blog-Commit: cc49afbeb90386f942ee1a6b8d15ff4088cb4e59

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website