Update readme to reflect Amplify library choices (#687)

* Implement `isObject` function that checks for `null` and `object` type to avoid keying on null object

* Fix syntax error

* updates

* update information about appsync service and amplify options

* update heading

* update heading

* Update README.md

remove node and angular dead links

* move v3 to top

* point to correct apollo docs

Author: onlybakam