Update README.md

Author: cheton

README.md

@@ -1,6 +1,6 @@
 # gcode-toolpath [![build status](https://travis-ci.org/cheton/gcode-toolpath.svg?branch=master)](https://travis-ci.org/cheton/gcode-toolpath) [![Coverage Status](https://coveralls.io/repos/github/cheton/gcode-toolpath/badge.svg?branch=master)](https://coveralls.io/github/cheton/gcode-toolpath?branch=master)
 
-[![NPM](https://nodei.co/npm/gcode-toolpath.png?downloads=true&stars=true)](https://nodei.co/npm/gcode-toolpath/)
+[![NPM](https://nodei.co/npm/gcode-toolpath.png?downloads=true&stars=true)](https://www.npmjs.com/package/gcode-toolpath)
 
 ## Install