Update README.md

Added Synthical (https://synthical.com)
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@ -80,6 +80,7 @@ A curated list of awesome mathematics resources.
* [Brilliant](https://brilliant.org/courses/#math-foundational)
* [WooTube](https://misterwootube.com/)
* [Mathigon](https://mathigon.org/)
* [Synthical](https://synthical.com)
* [Calculus.org](http://calculus.org/)
* [Ximera](https://ximera.osu.edu/) : free interactive mathematics textbooks (Ohio State University)
* [MathRelay](https://www.mathrelay.com/)