title: set circle size and label size on venn diagram with matplotlib-venn
body: <p>I have a couple of different Venn diagrams created with matplotlib-venn library, which share at least one set. I would like the circle of that set to be of the same size on both, so they are comparable. I would also like to change the size of the font of the labels, but I don't understand yet how to get that from the matplotlib-venn functions. How could I do it?</p>
  
  <p>an example of the sets could be something like this:</p>
  
  <pre><code>from matplotlib_venn import venn3
  
  s1=set('abracadabra')
  s2=set('alakazam')
  s3=set('stackoverflow')
  s4=set('hocus pocus')
  v_test1=venn3([s1,s2,s3],('set1','set2','set3'))
  v_test1=venn3([s1,s3,s4],('set1','set3','set4'))
  </code></pre>