Bump version number to 4.0.0-beta2

Author: advancingu

install.rdf

@@ -5,7 +5,7 @@
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>exchangecalendar@extensions.1st-setup.nl</em:id>
-    <em:version>4.0.0-beta1</em:version>
+    <em:version>4.0.0-beta2</em:version>
     <em:targetApplication>
       <Description>
       	<!-- Thunderbird -->