Update status in README

Author: MscottB

README.md

@@ -1,3 +1,5 @@
+# Repository archived due to non-use and lack of updating, in addition to better options.
+
 [![NPM version](https://badge.fury.io/js/purecss-onefile.svg)](https://badge.fury.io/js/purecss-onefile)
 [![GitHub version](https://badge.fury.io/gh/skotvarg%2Fpurecss-onefile.svg)](https://badge.fury.io/gh/skotvarg%2Fpurecss-onefile)
 [![David](https://img.shields.io/david/dev/expressjs/express.svg)](https://github.com/skotvarg/purecss-onefile)
@@ -58,4 +60,4 @@ Copyright (c) 2017 Michael Scott B
 
 For more information see the [LICENSE file][]
 
-[LICENSE file]: https://github.com/MscottB/purecss-onefile/blob/master/LICENSE.md
+[LICENSE file]: https://github.com/MscottB/purecss-onefile/blob/master/LICENSE.md