editor should use external props not internal state

[thecaddy]

This editor uses an internal state meaning it is always editable but it should be controlled by an external prop where the parent controls the value whether by store, state, or something else.

[zhaoyao91]

+1

[owenhoskins]

+1

[shark0der]

While it sounds logical it might be harder to implement it due to this: https://github.com/wangzuo/react-medium-editor/issues/30#issuecomment-230005992