Update go minimum versions to reflect the inclusion of Gitaly.

doc/update/10.6-to-10.7.md

@@ -80,8 +80,8 @@ More information can be found on the [yarn website](https://yarnpkg.com/en/docs/
 
 ### 5. Update Go
 
-NOTE: GitLab 9.2 and higher only supports Go 1.8.3 and dropped support for Go
-1.5.x through 1.7.x. Be sure to upgrade your installation if necessary.
+NOTE: GitLab 9.2 and higher only supports Go 1.9 and dropped support for Go
+1.5.x through 1.8.x. Be sure to upgrade your installation if necessary.
 
 You can check which version you are running with `go version`.
 
@@ -91,11 +91,11 @@ Download and install Go:
 # Remove former Go installation folder
 sudo rm -rf /usr/local/go
 
-curl --remote-name --progress https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz
-echo '1862f4c3d3907e59b04a757cfda0ea7aa9ef39274af99a784f5be843c80c6772  go1.8.3.linux-amd64.tar.gz' | shasum -a256 -c - && \
-  sudo tar -C /usr/local -xzf go1.8.3.linux-amd64.tar.gz
+curl --remote-name --progress https://storage.googleapis.com/golang/go1.9.linux-amd64.tar.gz
+echo 'd70eadefce8e160638a9a6db97f7192d8463069ab33138893ad3bf31b0650a79  go1.9.linux-amd64.tar.gz' | shasum -a256 -c - && \
+  sudo tar -C /usr/local -xzf go1.9.linux-amd64.tar.gz
 sudo ln -sf /usr/local/go/bin/{go,godoc,gofmt} /usr/local/bin/
-rm go1.8.3.linux-amd64.tar.gz
+rm go1.9.linux-amd64.tar.gz
 ```
 
 ### 6. Get latest code