Add a link to https://lobste.rs/t/pdf

README.md

@@ -49,6 +49,7 @@ We're looking for pull requests related to papers we should add, better organiza
 * [Gradual Typing Bibliography](http://samth.github.io/gradual-typing-bib/)
 * [Security Data Science Papers](http://www.covert.io/security-datascience-papers/)
 * [Research Papers from Robert Harper, Carnegie Mellon University](http://www.cs.cmu.edu/~rwh/papers.htm)
+* [Lobste.rs tagged as PDF](https://lobste.rs/t/pdf)
 
 Please check out our [wiki-page](https://github.com/papers-we-love/papers-we-love/wiki/Other-Good-Sources-of-Reading-Material) for links to blogs, books, exchanges that are worth a good read.