doc/ex/Use01.rb in rmagick-2.16.0 vs doc/ex/Use01.rb in rmagick-3.0.0

@@ -6,10 +6,10 @@
   canvas.background_fill = 'white'
   canvas.desc = "Example Use01 - Simple case of 'use' on a 'rect'"
   r = Magick::RVG::Group.new do |grp|
     grp.rect(60, 10)
   end
-  canvas.rect(99.6, 29.6, 0.1, 0.1).styles(:fill=>'none', :stroke=>'blue', :stroke_width=>0.2)
+  canvas.rect(99.6, 29.6, 0.1, 0.1).styles(fill: 'none', stroke: 'blue', stroke_width: 0.2)
   canvas.use(r, 20, 10)
 end
 
 rvg.draw.write('Use01.gif')