Update version number to v0.6.0

Author: afshinm

package.json

@@ -1,7 +1,7 @@
 {
     "name": "Intro.js",
     "description": "Better introductions for websites and features with a step-by-step guide for your projects",
-    "version": "0.5.0",
+    "version": "0.6.0",
     "author": "Afshin Mehrabani <[email protected]>",
     "repository": {
         "type": "git",
@@ -14,4 +14,4 @@
         "node >=0.1.90"
     ],
     "main": "intro.js"
-}
+}