made conditionals for imports

Author: yankev

plotly/widgets/graph_widget.py

@@ -9,14 +9,14 @@
 
 
 # TODO: protected imports?
-import Ipython
+import IPython
 from IPython.display import Javascript, display
 
 import plotly.plotly.plotly as py
 from plotly import utils, tools
 from plotly.graph_objs import Figure
 
-if Ipython.version_info[0] > 3:
+if IPython.version_info[0] > 3:
     import ipywidgets as widgets
     from traitlets import Unicode
 else: