fix license badge

Author: make-github-pseudonymous-again

README.md

@@ -25,7 +25,7 @@ let heaps = [
 ] ;
 ```
 
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+[![License](https://img.shields.io/github/license/aureooms/js-binomial-heap.svg?style=flat)](https://raw.githubusercontent.com/aureooms/js-binomial-heap/master/LICENSE)
 [![NPM version](https://img.shields.io/npm/v/@aureooms/js-binomial-heap.svg?style=flat)](https://www.npmjs.org/package/@aureooms/js-binomial-heap)
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