update badge [skip ci]

Author: jcmgray

README.md

@@ -12,7 +12,7 @@ A lightweight python AUTOmatic-arRAY library. Write numeric code that works for:
 * [pytorch](https://pytorch.org/)
 * ... and indeed **any** library that provides a numpy-*ish* api.
 
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 As an example consider this function that orthogonalizes a matrix using the modified [Gram-Schmidt](https://en.wikipedia.org/wiki/Gram%E2%80%93Schmidt_process) algorithm: