Merge pull request #1173 from plotly/update-get_plotschema-for-python-3

Update get_plotschema.py

Author: michaelbabyn

get_plotschema.py

@@ -6,5 +6,5 @@
 plotschema = requests.get('https://api.plot.ly/v2/plot-schema/?sha1=%27%27',
                           headers={'plotly-client-platform': 'python'},
                           auth=('plotly_docs', 'ikwqmjam2o')).content
-f = open('_data/plotschema.json', 'w')
+f = open('_data/plotschema.json', 'wb')
 f.write(plotschema)