Updating readme with correct sinatra config

README.md

@@ -2,7 +2,7 @@
 
 **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.
+**The [2.x branch](https://github.com/twitter/secureheaders/tree/2.x) will be maintained**. The documentation below only applies to the 3.x branch. See the 2.x [README](https://github.com/twitter/secureheaders/blob/2.x/README.md) for the old way of doing things.
 
 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/)
@@ -269,7 +269,7 @@ require 'secure_headers'
 
 use SecureHeaders::Middleware
 
-SecureHeaders::Configuration.configure do |config|
+SecureHeaders::Configuration.default do |config|
   ...
 end