removed nose from test requirements

Author: emmanuelle

packages/python/plotly/tox.ini

@@ -53,7 +53,6 @@ deps=
     coverage==4.3.1
     decorator==4.0.9
     mock==2.0.0
-    nose==1.3.7
     requests==2.12.4
     six==1.10.0
     pytz==2016.10