Merge pull request #295 from twbs/versioning-policy-readme

copy SemVer explanation from Bootstrap's README

README.md

@@ -43,6 +43,22 @@ A small list of "gotchas" are provided below for designers and developers starti
 - Ratchet uses XHR requests to fetch additional pages inside the application. Due to security concerns, modern browsers prevent XHR requests when opening files locally (aka using the file:/// protocol); consequently, Ratchet does not work when opened directly as a file.
     - A common solution to this is to simply serve the files from a local server. One convenient way to achieve this is to run ```python -m SimpleHTTPServer <port>``` to serve up the files in the current directory to ```http://localhost:<port>```
 
+## Versioning
+
+For transparency into our release cycle and in striving to maintain backward compatibility, Ratchet is maintained under the Semantic Versioning guidelines. Sometimes we screw up, but we'll adhere to these rules whenever possible.
+
+Releases will be numbered with the following format:
+
+`<major>.<minor>.<patch>`
+
+And constructed with the following guidelines:
+
+- Breaking backward compatibility **bumps the major** while resetting minor and patch
+- New additions without breaking backward compatibility **bumps the minor** while resetting the patch
+- Bug fixes and misc changes **bumps only the patch**
+
+For more information on SemVer, please visit <http://semver.org/>.
+
 ## Maintainers
 
 Connor Sears