Fix a broken link (sindresorhus#1300)

Author: cwtuan

readme.md

@@ -858,7 +858,7 @@
 
 - [npms](https://npms.io) - Superb package search with deep analysis of package quality using a [myriad of metrics](https://npms.io/about).
 - [npm addict](https://npmaddict.com) - Your daily injection of npm packages.
-- [npmcompare.com](https://npmcompare.com) - Compare and discover npm packages.
+- [npm-compare.com](https://npm-compare.com) - Compare and discover npm packages.
 
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