added Changes that could break and Other changes sections

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1453667 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -1,12 +1,18 @@
 Changes from Ant 1.9.0 TO current
 ===================================
 
+Changes that could break older environments:
+-------------------------------------------
+
 Fixed bugs:
 -----------
 
  * Corrected XSLTC error in <junitreport>.
    Bugzilla Report 54641.
 
+Other changes:
+--------------
+
 Changes from Ant 1.8.4 TO Ant 1.9.0
 ===================================