Bump to 0.5.0

- Support parsing `.svg` files in to Gradient maps using `Gradient::SVG.parse` (credit: [@jjgreen](https://github.com/jjgreen))
- Interpolating points on a gradient map (credit: [@jjgreen](https://github.com/jjgreen))

Author: zeevallin

lib/gradient/version.rb

@@ -1,3 +1,3 @@
 module Gradient
-  VERSION = "0.4.0"
+  VERSION = "0.5.0"
 end