fix license badge

Author: make-github-pseudonymous-again

README.md

@@ -16,7 +16,7 @@ M.get( "y" ) ; // "B"
 M.get( "z" ) ; // "C"
 ```
 
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+[![License](https://img.shields.io/github/license/aureooms/js-collections-chainmap.svg?style=flat)](https://raw.githubusercontent.com/aureooms/js-collections-chainmap/master/LICENSE)
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