message: Fix matplot deprecation warning
  Fix matplot deprecation warning in rss merging example.
  MatplotlibDeprecationWarning: Case-insensitive properties were deprecated in 3.3 and support will be removed two minor releases later
diff: @@ -37,12 +37,12 @@ class MPViewer(BaseViewer):
  marker='x')
  def drawLine2d(self, line2d, color='blue', alpha=1.0, dashed=False, zorder=1, linewidth=1):
  - lineStyle_string = (0, (5, 10)) if dashed else 'solid'
  + linestyle_string = (0, (5, 10)) if dashed else 'solid'
  line2d_np = line2d.ToArray()
  self.axes.plot(
  line2d_np[:, 0],
  line2d_np[:, 1],
  - lineStyle=lineStyle_string,
  + linestyle=linestyle_string,
  color=self.getColor(color),
  alpha=alpha,
  zorder=zorder,
  