Update CircleCI status badge

Author: philipstanislaus

README.md

@@ -2,7 +2,7 @@
 
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+[![CircleCI](https://circleci.com/gh/philipstanislaus/performant-array-to-tree/tree/master.svg?style=shield&circle-token=01828caf71908b915230609847a12272cc80c54d)](https://circleci.com/gh/philipstanislaus/performant-array-to-tree/tree/master)
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 [![Dependency Status](https://david-dm.org/philipstanislaus/performant-array-to-tree.svg)](https://david-dm.org/philipstanislaus/performant-array-to-tree)
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