update should to 3.3.1

Author: dougwilson

package.json

@@ -67,10 +67,10 @@
     "ejs": "~0.8.4",
     "istanbul": "0.2.10",
     "mocha": "~1.18.2",
+    "should": "~3.3.1",
     "jade": "~0.30.0",
     "hjs": "~0.0.6",
     "stylus": "~0.40.0",
-    "should": "~2.1.1",
     "connect-redis": "~1.4.5",
     "marked": "0.2.10",
     "supertest": "~0.12.1"