fix: update GitSpo badge URL

fix: correct GitSpo badge markdown

fix: unfreeze nested children array before passing it to linkArray (#293

)

chore: add .editorconfig

fix: assign a generated className to elements inside nested arrays (#292

)

fix: #285 react-css-modules causes modifying key property of the comp…

…onent children (#286)

docs: add DEPRECATION NOTICE

fix: use latest node to run tests

fix: Flow "Cannot resolve module" errors on Windows (#280)

Flow on Windows seems to be unable to correctly resolve imports from `react-css-modules` package, because its `main` entry in `package.json` points to a directory, instead of directly pointing to the script `dist/index.js`. 

Fixing it here seems to be easier than looking for a platform specific issue in Flow.

fix: React 16 issues (fixes #269, #200, #259)

* Check if both element and props are frozen or not extensible (#200)

Fixes #200

* Only check extensiblity of props

Also run preventExtensions on it after modifications

* Check if just the props are frozen (#266)

* Recursively map element arrays

Fixes #259

* Add tests

For element arrays and frozen elements/props