Bumping contents.rdf's version to match main code.

ChatZilla only.
r=silver

extensions/irc/xul/content/contents.rdf

@@ -9,7 +9,7 @@
 
   <!-- package information -->
   <RDF:Description about="urn:mozilla:package:chatzilla"
-        chrome:displayName="ChatZilla 0.9.70"
+        chrome:displayName="ChatZilla 0.9.71"
         chrome:author="mozilla.org"
         chrome:authorURL="http://www.mozilla.org/projects/rt-messaging/chatzilla/"
         chrome:description="A simple, straightforward Internet Relay Chat (IRC) client."