Warn users about usage.

This fixes #47.
anselmh · Jan 6, 2016 · 71303f1 · 71303f1
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 This is a headless polyfill for the CSS `object-fit` property which defines the sizing mode for content images (similar to background-size for CSS background sources).
 
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+## NOTICE: DEPRECATED / Non-Functional
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+Please note that as Microsoft Edge does not support a good way to [get matching CSS rules](https://github.com/anselmh/object-fit/issues/45), and there are a couple of [other issues](https://github.com/anselmh/object-fit/issues) that aren’t likely to be fixed, this polyfill is of limited benefit for most projects as all other browser vendors support `object-fit` natively now.
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 ## The Webstandard
 
 The specification for `object-fit` is to be found at [W3C CSS3 Images](http://www.w3.org/TR/css3-images/#the-object-fit). The property scales the image to fit in a certain way into a defined area, e.g: