Merge pull request #29 from sisp/fix-readme

Fix color format type "rgba" in README

README.md

@@ -25,7 +25,7 @@ Property | Default | Meaning
 ---|---|---
 `colormap` | `'jet'` | Color map name from the image above or a custom color scale — a sequence of `{index, rgb}` objects, where index is `0..1` number and `rgb` is a length 3/4 array with values for the color stop.
 `nshades` | `72` | Number of colors in returned array, the minimum number depends on `colormap`.
-`format` | `'hex'` | `'hex'` for `#aabbcc`, `'rgbaString'` for `rgba(255, 255, 255, 1)`, `'rba'` for `[255, 255, 255, 1]`, `'float'` for `[1, 1, 1, 1]`.
+`format` | `'hex'` | `'hex'` for `#aabbcc`, `'rgbaString'` for `rgba(255, 255, 255, 1)`, `'rgba'` for `[255, 255, 255, 1]`, `'float'` for `[1, 1, 1, 1]`.
 `alpha` | `1` | Alpha range, can be an array with alpha values or just 2 values for start/end colors. |