Change effective on 27 January 2017
Heroku’s support for Go has been upgraded to include Go 1.7.5. Future deploys with a
go1.7 specifier will use this version.
go1.7.5 (released 2017/01/26) includes fixes to the compiler, runtime, and the crypto/x509 and time packages.
Users of go1.7 should push a new commit to force a rebuild with the latest version of Go.