Upgrade dev dependencies

Author: almost

package.json

@@ -9,10 +9,10 @@
     "dependencies": {
     },
     "devDependencies": {
-        "mocha": "1.8.1",
-        "expect.js": "0.2.0",
-        "jshint": "0.3.0",
-        "uglify-js": "2.3.5"
+        "expect.js": "^0.3.1",
+        "jshint": "^2.5.10",
+        "mocha": "^2.0.1",
+        "uglify-js": "^2.4.15"
     },
     "scripts": {
         "test": "mocha test/test.*.js && jshint lib",