Mention committing version.go

Author: horgh

README.dev.md

@@ -8,7 +8,7 @@
   * Set a version if there is not one.
   * Set a release date.
 * Set version in `version.go`.
-* Commit `CHANGELOG.md`.
+* Commit `CHANGELOG.md` and `version.go`.
 * Tag the release: `git tag -a v1.2.3 -m 'Tag v1.2.3'`.
 * Push the tag: `git push origin v1.2.3`.
 * Run `goreleaser`.