don't use strictPropertyInitialization

allows initializing attributes in the `initialize` function run by backbonejs

Author: ianhi

{{cookiecutter.github_project_name}}/tsconfig.json

@@ -13,6 +13,7 @@
     "skipLibCheck": true,
     "sourceMap": true,
     "strict": true,
+    "strictPropertyInitialization": false,
     "target": "es2015"
   },
   "include": [