Update the Fn Go introduction tutorial to use `fn init --runtime go gofn` to generate hello function and JSON data. * [x] Create a branch to make changes * [x] Update the tutorial * [x] Submit a PR https://github.com/fnproject/tutorials/pull/41 * [x] Merge and close PR https://github.com/fnproject/tutorials/pull/41