clean up package versions

packages/extension-builder/package.json

@@ -28,9 +28,9 @@
   "devDependencies": {
     "@types/expect.js": "^0.3.29",
     "@types/extract-text-webpack-plugin": "^2.0.1",
-    "@types/mocha": "^2.2.40",
+    "@types/mocha": "^2.2.32",
     "@types/semver": "^5.3.31",
-    "mocha": "^3.2.0",
+    "mocha": "^2.3.4",
     "rimraf": "^2.5.2",
     "typescript": "^2.2.1"
   },