docs(badge): Update npm version badge link

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Author: Harrison Ifeanyichukwu

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.org/harrison-ifeanyichukwu/xml-serializer.svg?branch=master)](https://travis-ci.org/harrison-ifeanyichukwu/xml-serializer)
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 XML-Serializer is A JavaScript complete implementation of the W3C [xml serialization](https://www.w3.org/TR/DOM-Parsing/#dfn-concept-serialize-xml) spec. All specifications have been implemented and includes the following [specs](https://www.w3.org/TR/DOM-Parsing/#dfn-concept-xml-serialization-algorithm):