The component will not be updated by React itself

[pomek]

Suggested merge commit message (convention)

Fix: The <CKEditor> component will not be updated by React itself. The editor won't freeze if #data property was specified as a static string. Closes #75. Closes #78.

[coveralls]

Pull Request Test Coverage Report for Build 169

• 10 of 10 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 165:	0.0%
Covered Lines:	42
Relevant Lines:	42

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💛 - Coveralls

[pomek]

I have an idea of how to update the editor's content when the state has changed. Let me introduce some improvements to this PR.

[pomek]

@ma2ciek, go ahead.

[ma2ciek]

I'm not glad that the editor state changes will go to the shouldComponentUpdate, but since for now it's the only possible way to prevent React from removing CKEditor5 DOM elements on rerendering, I'm merging it. Maybe we'll find a better approach in the future.