fix(package): update yeoman-generator to version 4.0.0

Closes #30

Author: greenkeeper[bot]

package.json

@@ -31,7 +31,7 @@
     "donejs-generator-common": "^1.0.5",
     "ejs": "^2.3.4",
     "q": "^1.4.1",
-    "yeoman-generator": "^1.1.1"
+    "yeoman-generator": "^4.0.0"
   },
   "devDependencies": {
     "fs-extra": "^2.1.2",