Updated plugin version to 1.3.1

Author: tjwoon

plugin.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
-        id="org.cloudsky.cordovaplugins.zbar" version="1.3.0">
+        id="org.cloudsky.cordovaplugins.zbar" version="1.3.1">
 
     <engines>
         <engine name="cordova" version=">=3.0.0" />