title: How can I change colors of series of survival plot in highcharter?
body: <p>I'm trying to change the colors of the <strong>survival plot</strong> series in highcharter in R.
  <strong>hc_colors</strong> doesn't work. I can only change the color of all lines using lineColor argument with <strong>hc_plotOptions</strong>.</p>
  <pre><code>library('survival')
  library('highcharter')
  leukemia.surv &lt;- survfit(Surv(time, status) ~ x, data = aml)
  
  # this doesn't work, the lines are in default colors
  highcharter::hchart(leukemia.surv)%&gt;%
    hc_colors(c(&quot;#0073C2FF&quot;, &quot;#EFC000FF&quot;))
  
  # this results with all lines in blue
  highcharter::hchart(leukemia.surv)%&gt;%
    hc_plotOptions(series = list(lineColor = &quot;blue&quot;))
  </code></pre>