title: geom_smooth option missing ggplot from python
body: <p>I am trying to make plot using ggplot in python. When I try to run, I get an error"</p>
  
  <p><code>ggplot(data,aes(x='Average Credit Card Transaction',y='response'))+\
  geom_smooth(se=False,span=0.2)+xlab("Average Credit Card Transaction")+\
  ylab('Response')+\
  ggtitle('Partial Dependence Plot \n Response Vs Average Credit Card transactions')</code></p>
  
  <p><code>NameError: name 'geom_smooth' is not defined</code></p>
  
  <p>Everything else works. Was that a bug which was fixed in later versions?</p>