Update history and bump version to 3.10 (#238)

History.md

@@ -1,3 +1,10 @@
+3.10 / 2017-05-16
+==================
+  * Update maxVersions of applications in install.rdf (#238)
+  * Only use comma separator for extension list in text fields (#230)
+  * Mark extension as multi-process compatible (#228)
+  * Update ja and ja-JP-mac translation (#233)
+
 3.9 / 2016-10-12
 ==================
   * Add Japanese (ja) locale (#226)

extension/install.rdf

@@ -7,7 +7,7 @@
 
   <Description about="urn:mozilla:install-manifest">
     <em:id>{8620c15f-30dc-4dba-a131-7c5d20cf4a29}</em:id>
-    <em:version>3.10pre</em:version>
+    <em:version>3.10</em:version>
     <em:type>2</em:type>
     <em:multiprocessCompatible>true</em:multiprocessCompatible>