fix(package): update yeoman-test to version 2.2.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "chalk": "^1.1.3",
     "yeoman-assert": "^3.0.0",
     "yeoman-generator": "^1.0.1",
-    "yeoman-test": "^1.5.1",
+    "yeoman-test": "^2.2.0",
     "yosay": "^2.0.0"
   },
   "devDependencies": {