Merge pull request #13 from plotly/readme-fix

fix readme ref

Author: BRONSOLO

.github/README.md

@@ -6,7 +6,7 @@
 
 # Paketo Buildpack for CPython Cloud Native
 
-A copy of the upstream README.md can be found here: [README-upstream.md](../README-upstream.md)
+A copy of the upstream README.md can be found here: [README.md](../README.md)
 
 # Plotly Branches