doc: improve release steps

Author: flavorjones

CONTRIBUTING.md

@@ -27,7 +27,8 @@ A quick checklist:
 
 - [ ] make sure CI is green!
 - [ ] update `CHANGELOG.md` and `lib/sqlite3/version.rb` including `VersionProxy::{MINOR,TINY}`
-- [ ] create a git tag using a format that matches the pattern `v\d+\.\d+\.\d+`, e.g. `v1.3.13`
 - [ ] run `bin/build-gems` and make sure it completes and all the tests pass
+- [ ] create a git tag using a format that matches the pattern `v\d+\.\d+\.\d+`, e.g. `v1.3.13`
+- [ ] `git push && git push --tags`
 - [ ] `for g in gems/*.gem ; do gem push $g ; done`
 - [ ] create a release at https://github.com/sparklemotion/sqlite3-ruby/releases and include sha2 checksums