Add missing dependency

Author: developit

package.json

@@ -46,6 +46,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "2.0.7",
     "puppeteer": "^1.0.0",
+    "sade": "^1.3.1",
     "script-loader": "^0.7.2",
     "webpack": "^3.10.0"
   }