updated api_changes.rst to reflect the return value change of twinx and twiny

leejjoon · leejjoon · commit 14e34cca4300 · 2012-08-29T23:06:49.000+09:00
diff --git a/doc/api/api_changes.rst b/doc/api/api_changes.rst
@@ -120,6 +120,10 @@ Changes in 1.2.x
   ``ax.transData + ax.transAxes.inverted()`` (depth is a new concept, but had it existed 
   it would return 4 for this example).      
 
+* ``twinx`` and ``twiny`` now returns an instance of SubplotBase if
+  parent axes is an instance of SubplotBase.
+  
+
 Changes in 1.1.x
 ================
 
