update dep @adobe/generator-app-common-lib@3 (#67)

Author: purplecabbage

package.json

@@ -44,7 +44,7 @@
     "yeoman-test": "^6.0.0"
   },
   "dependencies": {
-    "@adobe/generator-app-common-lib": "^2",
+    "@adobe/generator-app-common-lib": "^3",
     "lodash.camelcase": "^4.3.0",
     "upath": "^2.0.1",
     "yeoman-generator": "^5.4.2"