Addition of 'this.context' component breaking change

this.context on components is now reserved for internal use by React

closes #1141

_posts/2014-02-16-react-v0.9-rc1.md

@@ -68,6 +68,7 @@ In cases where you want to preserve the space adjacent to a newline, you can wri
 - On mouse wheel events, `deltaY` is no longer negated
 - When prop types validation fails, a warning is logged instead of an error thrown (with the production build of React, the type checks are now skipped for performance)
 - On `input`, `select`, and `textarea` elements, `.getValue()` is no longer supported; use `.getDOMNode().value` instead
+- this.context on components is now reserved for internal use by React
 
 #### New Features
 

_posts/2014-02-20-react-v0.9.md

@@ -76,6 +76,7 @@ In cases where you want to preserve the space adjacent to a newline, you can wri
 - On mouse wheel events, `deltaY` is no longer negated
 - When prop types validation fails, a warning is logged instead of an error thrown (with the production build of React, type checks are now skipped for performance)
 - On `input`, `select`, and `textarea` elements, `.getValue()` is no longer supported; use `.getDOMNode().value` instead
+- this.context on components is now reserved for internal use by React
 
 #### New Features