circleci: Bump to Go 1.9.2
circleci: Bump to Go 1.9.2

Closes #4064

anthonyfok/hugo,fedelibre/hugo,gohugoio/hugo,anthonyfok/hugo,anthonyfok/hugo,gohugoio/hugo,fedelibre/hugo,mdhender/hugo,gohugoio/hugo,mdhender/hugo,fedelibre/hugo,mdhender/hugo,fedelibre/hugo,mdhender/hugo