Update index.md

Author: vraychev

datasets/index.md

@@ -14,6 +14,14 @@ In case a dataset is useful for a specific task, a <a href="/challenges">challen
 The datasets here should not require sign-up for web services or writing emails to their authors or third parties.
 
 
+<div class="highlightitem">
+<h1 id="javascript-asts">Python ASTs</h1>
+
+<p>This dataset includes 100'000 + 50'000 python files as parsed abstract syntax trees along with the code of the parser (that wraps the built-in Python AST parser)<br>
+
+<a href="http://www.srl.inf.ethz.ch/py150">[download dataset]</a></p>
+</div>
+
 <div class="highlightitem">
 <h1 id="javascript-asts">JavaScript ASTs</h1>