send plugin with heartbeat data to fix #41

assets/js/config.js

@@ -1,6 +1,8 @@
 var config = {
     // Extension name
     name: 'WakaTime',
+    // Extension version
+    version: '1.0.0',
     // Time for idle state of the browser
     // The user is considered idle if there was
     // no activity in the browser for x seconds

assets/js/core/WakaTime.js

@@ -151,7 +151,8 @@ class WakaTime {
             type: type,
             time: moment().format('X'),
             project: '<<LAST_PROJECT>>',
-            is_debugging: debug
+            is_debugging: debug,
+            plugin: 'chrome-wakatime/' + config.version
         });
     }