Merge pull request #167 from plotly/use-app-run

update usage app to use app.run

Author: LiamConnors

{{cookiecutter.project_shortname}}/usage.py

@@ -19,4 +19,4 @@ def display_output(value):
 
 
 if __name__ == '__main__':
-    app.run_server(debug=True)
+    app.run(debug=True)