README.md: HTTP => HTTPS (#443)

Author: Schweinepriester

README.md

@@ -1,6 +1,6 @@
 # eslint-plugin-prettier [![Build Status](https://github.com/prettier/eslint-plugin-prettier/workflows/CI/badge.svg?branch=master)](https://github.com/prettier/eslint-plugin-prettier/actions?query=workflow%3ACI+branch%3Amaster)
 
-Runs [Prettier](https://github.com/prettier/prettier) as an [ESLint](http://eslint.org) rule and reports differences as individual ESLint issues.
+Runs [Prettier](https://github.com/prettier/prettier) as an [ESLint](https://eslint.org) rule and reports differences as individual ESLint issues.
 
 If your desired formatting does not match Prettier’s output, you should use a different tool such as [prettier-eslint](https://github.com/prettier/prettier-eslint) instead.