fix camel-case capitalization of minLength and maxLength in FormInput component

[ubergesundheit]

I noticed my tests and development versions printed out this warning when using Form.Input components:

Warning: Invalid DOM property `maxlength`. Did you mean `maxLength`?
          in input (created by Form.Input)
          in Form.Input (created by DropdownMenu)
          in div (created by Form.InputGroup)
         ....

This pull request fixes this issue by renaming minlength to minLength and maxlength to maxLength in src/components/Form/FormInput.react.js

I guess this is somewhat a breaking change but it makes tabler-react more correct against the official standards.

Cheers!

[jonthomp]

@ubergesundheit I was tempted to just release this as minor bump rather than breaking change but sticking to the rules it should be breaking as you suggest 🤷‍♂️

What do you think about keeping all 4 options so we avoid breaking?

[ubergesundheit]

Fine with me, as long as the warning is resolved. I'll see if keeping both options triggers the warning or not.

[ubergesundheit]

@jonthomp I tried your suggestion adding the correct properties instead of replacing, but this triggers the invalid DOM property warning.

I am fine with this being merged into a major release.

[PetrVasilev]

I'm starting to get annoyed by this error. When can you fix it?

[jonthomp]

Closing this and merging #440 instead as includes an additional fix