Add reference to 2.x branch/README

github · Dec 11, 2015 · 4458c1c · 4458c1c
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 **The 3.x branch was recently merged**. See the [upgrading to 3.x doc](upgrading-to-3-0.md) for instructions on how to upgrade including the differences and benefits of using the 3.x branch.
 
+**The [2.x branch](https://github.com/twitter/secureheaders/tree/2.x) will be maintained**. The documentation below only applies to the 2.x branch. See the 2.x [README](https://github.com/twitter/secureheaders/blob/2.x/README.md) for the old way of doing things.
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 The gem will automatically apply several headers that are related to security.  This includes:
 - Content Security Policy (CSP) - Helps detect/prevent XSS, mixed-content, and other classes of attack.  [CSP 2 Specification](http://www.w3.org/TR/CSP2/)
 - HTTP Strict Transport Security (HSTS) - Ensures the browser never visits the http version of a website. Protects from SSLStrip/Firesheep attacks.  [HSTS Specification](https://tools.ietf.org/html/rfc6797)