Up maxVersion for add-on to work in minefield.

extensions/firefox-share/src/install.rdf

@@ -15,7 +15,7 @@
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <!-- Firefox -->
         <em:minVersion>4.0b10pre</em:minVersion>
-        <em:maxVersion>4.0.*</em:maxVersion>
+        <em:maxVersion>4.2a1pre</em:maxVersion>
       </Description>
     </em:targetApplication>
   </Description>