Update README with data link

readme.md

@@ -1,8 +1,10 @@
 # Jupyter Notebooks on Github
 In July 2017 we searched for, downloaded, and analyzed the approximately 1.3
 million public Jupyter Notebooks on Github at the time. This repository includes
-the notebooks used to query and analyze that dataset. We are working on making the
-raw notebook data (about 600 Gb) available for public use.
+the scripts used to query and analyze that dataset. The full dataset is now 
+[available online](https://library.ucsd.edu/dc/collection/bb6931851t) thanks to 
+hosting provided by the UC San Diego Library. The full dataset is nearly 600GB 
+so we have created a smaller 5GB sampler dataset for you to get started.
 
 In our analysis, we looked primarily at how notebooks employ narrative (operationalized as
 markdown text). Our main finding was that many notebooks (~27%) include no