optimize webpack and other minor changes

Author: enuchi

.prettierrc.json

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

appsscript.json

@@ -1,9 +1,10 @@
 {
   "timeZone": "America/New_York",
-  "dependencies": {
-  },
+  "dependencies": {},
+  "exceptionLogging": "STACKDRIVER",
   "oauthScopes": [
     "https://www.googleapis.com/auth/script.container.ui",
     "https://www.googleapis.com/auth/spreadsheets"
-  ] 
-}
+  ],
+  "runtimeVersion": "V8"
+}