updated install.rdf with AMO friendly maxversion and no updateurl

testing/extensions/community/install.rdf

@@ -5,7 +5,7 @@
   <RDF:Description RDF:about="rdf:#$QJqvE"
                    em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
                    em:minVersion="2.0"
-                   em:maxVersion="3.0b4pre"/>
+                   em:maxVersion="3.0b5pre"/>
   <RDF:Description RDF:about="urn:mozilla:install-manifest"
                    em:id="{667e9f3d-0096-4d2b-b171-9a96afbabe20}"
                    em:version="0.1.8"