Update devDependencies

package.json

@@ -23,14 +23,14 @@
   "dependencies": {},
   "devDependencies": {
     "coveralls": "^2.11.2",
-    "eslint": "^0.13.0",
+    "eslint": "^0.18.0",
     "eslint-plugin-nodeca": "^1.0.3",
-    "istanbul": "^0.3.5",
-    "markdown-it": "^3.0.4",
+    "istanbul": "^0.3.13",
+    "markdown-it": "^4.1.0",
     "markdown-it-testgen": "^0.1.4",
-    "mocha": "^2.1.0",
-    "should": "^5.0.0",
-    "uglify-js": "^2.4.16",
-    "webpack": "^1.5.3"
+    "mocha": "^2.2.1",
+    "should": "^5.2.0",
+    "uglify-js": "^2.4.19",
+    "webpack": "^1.7.3"
   }
 }