Updated the compatibility on Edge
Updated the compatibility on Edge

According to [this answer](https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/suggestions/10945389-background-clip-text).
Tested on Edge 15.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,teoli2003/browser-compat-data