Updates readme with 'release' instructions.

Author: mitnal

README.md

@@ -108,6 +108,18 @@ After checking out the repo, run `bin/setup` to install dependencies. Then, run
 
 To install this gem onto your local machine, run `bundle exec rake install`.
 
+To push a new release to github:
+
+```shell
+# gem install gem-release
+
+# Patch version
+$ gem bump -pts
+
+# Minor version
+$ gem bump -v minor -pts
+```
+
 <!-- To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org). -->
 
 ## Contributing