Add note regarding support only for sprited thumbnails

I learned the hard way that this module does not work with thumbnail-per-segment VTTs; it's better to do sprites anyway but the thumbnails will load but not appear (no dimensions are set for the applicable DOM node) unless the VTT file contains the `xywh` info.
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Brad Jones 2019-05-12 14:50:45 -06:00 committed by GitHub
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# videojs-vtt-thumbnails
Video.js plugin that displays thumbnails on progress bar hover, driven by external VTT files. Based on the spec at: https://support.jwplayer.com/customer/portal/articles/1407439-adding-preview-thumbnails
Video.js plugin that displays thumbnails on progress bar hover, driven by external VTT files. Based on [this JW Player spec](https://support.jwplayer.com/customer/portal/articles/1407439-adding-preview-thumbnails). Note, this plugin currently only supports sprited thumbnails.
Note: Plugin hides the default skin's mouse display timestamp on hover.