yarn not required for builds anymore

rmorshea · rmorshea · commit 3fecd97d39ad · 2020-04-23T14:02:09.000-07:00
diff --git a/binder/postBuild b/binder/postBuild
@@ -2,5 +2,4 @@
 
 export JUPYTER_SERVER_URL
 jupyter serverextension enable --py jupyter_server_proxy --sys-prefix
-npm install -g yarn
 pip install .[all]
