UPdate plotly requirements.txt version to 4.1.0rc2 for CI

jonmmease · jonmmease · commit 8a4ed663306e · 2019-08-06T18:17:19.000-04:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-plotly==4.0.0
+plotly==4.1.0rc2
 jupytext==1.1.1
 jupyter
 notebook
