title: argument by name color scheme pycharm
body: <p>I am on PyCharm 2017.1.4 with Darcula theme.
  I don't see how to change the color of the named argument, which is currently undistinguishable for me.
  I have been into Editors > Colors &amp; Fonts but it seems that everything is tunable apart from that.</p>
  
  <p><a href="https://i.stack.imgur.com/3vwJB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/3vwJB.png" alt="example of bad argument name coloring"></a></p>