Update Readme to include branch details.

As Master is going to be used for code refactoring work (for a potential 3.0), the 2.0 branch has been created to separate bug fixes for the current code.
squizlabs · Nov 12, 2015 · 02ea409 · 02ea409
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@@ -10,6 +10,12 @@ HTML_CodeSniffer is released under a BSD-style licence. For more information, pl
 
 HTML_CodeSniffer comes with standards and sniffs that cover the three conformance levels of the W3C [Web Content Accessibility Guidelines (WCAG) 2.0](http://www.w3.org/TR/WCAG20), and the U.S. [Section 508](http://section508.gov/index.cfm?fuseAction=stdsdoc) legislation.
 
+## I want to develop something using HTML_CodeSniffer - which branch should I use?
+
+The `master` branch is the main development branch.
+
+The `2.0` branch is the current stable branch. Builds of the Accessibility Auditor occur off this branch (starting from version 2.0.6). If you are developing a tool based off HTML_CodeSniffer, it's probably best to use the appropriate version tags, or pin your version of HTML_CodeSniffer to the `2.0` branch.
+
 ## Contributing and reporting issues
 
 To report any issues with using HTML_CodeSniffer, please use the [HTML_CodeSniffer Issue Tracker](http://github.com/squizlabs/HTML_CodeSniffer/issues).