Open demo.ipynb directly in Binder

Fixed URL

README.md

@@ -1,4 +1,4 @@
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/JarnoRFB/epysurv/master?urlpath=lab/tree/demo.ipynb)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/JarnoRFB/epysurv/master?filepath=demo.ipynb)
 [![Build Status](https://travis-ci.com/JarnoRFB/epysurv.svg?token=dmY4GfBz2Rs5oxYeuMhW&branch=master)](https://travis-ci.com/JarnoRFB/epysurv)
 
 # epysurv
@@ -27,4 +27,4 @@ Coming soon... For now see [`demo.ipynb`](demo.ipynb).
 
 ## Related Projects
 * https://github.com/lvphj/epydemiology
-* https://github.com/cmrivers/epipy
+* https://github.com/cmrivers/epipy