title: Material-UI Core TextField globally set InputLabelProps shrink
body: <p>Does anyone know how to globally override the shrinking of the label with a Material-UI Textfield (or Input if I need to use this)?</p>
  
  <p>I dont want to add this everywhere: </p>
  
  <pre><code>...      
  InputLabelProps={{
      shrink: true,
  }}
  </code></pre>
  
  <p>but I cant seem to figure out the correct override in <code>createMuiTheme</code>.</p>
  
  <p>I have tried adding <code>shrink: true</code> here</p>
  
  <pre><code>overrides: {
      MuiInput: { ...
  </code></pre>
  
  <p>and here</p>
  
  <pre><code>overrides: {
      MuiInputLabel: { ...
  </code></pre>
  
  <p>But I cant get it working. </p>
  
  <p>If someone could point my to the docs/code to where they figured this out too, that would be awesome!</p>
  
  <p>Thanks</p>