Update dependencies (#669)

* Update appdmg

* Refresh yarn

Author: haslinghuis

package.json

@@ -51,7 +51,7 @@
     "yarn": "^1.22.0"
   },
   "optionalDependencies": {
-    "appdmg": "^0.6.2"
+    "appdmg": "^0.6.6"
   },
   "resolutions": {
     "**/**/lodash.template": "^4.5.0"