fix: update URL for Colorable

README.md

@@ -107,7 +107,7 @@ No need to mention the author.
 - [Paletton](http://paletton.com/)
 - [Palettable](http://www.palettable.io/) Generate beautiful color palettes using the knowledge of millions of designers.
 - [Picular](https://picular.co/)
-- [Colorable](http://jxnblk.com/colorable/demos/text/?background=%23FFFFFF&foreground=%23000000) Get contrast values for every color combination with pass/fail scores for the WCAG accessibility guidelines.
+- [Colorable](https://colorable.jxnblk.com/) “If one says ‘Red’ (the name of the color) and there are 50 people listening, it can be expected that there will be 50 reds in their minds. And one can be sure that all these reds will be very different.” – Josef Albers
 - [Google Colors](https://material.io/guidelines/style/color.html) The Material Design color system can be used to create a color theme that reflects your brand or style.
 - [WebGradients](https://webgradients.com/) Free collection of 180 linear gradients that you can use as content backdrops in any part of your website.
 - [Chinese Colors](http://zhongguose.com) is a collection of Chinese traditional colors.