package.json for node 0.8+

package.json

@@ -8,13 +8,13 @@
 		"url": "git://github.com/hakimel/reveal.js.git"
 	},
 	"engines": {
-		"node": "~0.6.8"
+		"node": "~0.8.0"
 	},
 	"dependencies": {
-		"underscore" : "1.3.3",
-		"express" : "2.5.9",
-		"socket.io" : "0.9.6",
-		"mustache" : "0.4.0"
+		"underscore" : "~1.3.3",
+		"express" : "~2.5.9",
+		"socket.io" : "~0.9.6",
+		"mustache" : "~0.4.0"
 	},
 	"devDependencies": {}
 }