Update README.md

Note preferCanvas setting
rowanwins · Mar 13, 2020 · f40348e · f40348e
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 # Leaflet.SvgShapeMarkers
 Additional SVG marker types for leaflet.js such as triangle, diamond and square. Check out the [demo](http://rowanwins.github.io/Leaflet.SvgShapeMarkers/example/).
 
+*Note*: Currently only works when `preferCanvas` isn't set to `true`.
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 ### Installing
 Either  downloading this repo or install from npm `npm install leaflet-svg-shape-markers`