Document how to publish a new version

Author: Gustavo Henke

MAINTAN.md

@@ -0,0 +1,13 @@
+# Maintainer Guide
+
+## Publishing a new version
+
+1. Determine which part of the version you are about to increase.
+   We follow the [Versioning & Semver](http://jscs.info/overview.html#versioning-semver) section from the JSCS project.
+2. Run a bump script via npm. This will commit and tag the changed files:
+    - `npm run bump` - will increase the patch version;
+    - `npm run bump-minor` - will increase the minor version.
+3. Push changes and tags: `git push --follow-tags`
+4. Wait until the Travis-CI build finishes. It will publish a new version into npm.
+   __DO NOT USE__ `npm publish`! If something goes wrong, Travis will tell us.
+5. Done!