Format skin variations table

Author: mmistakes

README.md

@@ -102,13 +102,14 @@ For more configuration options be sure to consult the documentation for:
 This theme comes in six different skins (color variations). To change skins add 
 one of the following to your [`/_data/theme.yml`](_data/theme.yml) file:
 
-|                 |               |               |
-| --------------- | ------------- | ------------- |
+| `skin: default` | `skin: night` | `skin: plum` |
+| --- | --- | --- |
 | ![default-skin](https://cloud.githubusercontent.com/assets/1376749/24115744/c0618c90-0d7a-11e7-8e2d-ec70f9db0c1b.png) | ![night-skin](https://cloud.githubusercontent.com/assets/1376749/24115770/d61127f8-0d7a-11e7-9158-986bee2be8e7.png) | ![plum-skin](https://cloud.githubusercontent.com/assets/1376749/24115778/db523a0e-0d7a-11e7-9452-8692b736d67e.png) |
-| `skin: default` | `skin: night` | `skin: plum`  |
+
+| `skin: sea` | `skin: soft` | `skin: steel` |
+| --- | --- | --- |
 | ![sea-skin](https://cloud.githubusercontent.com/assets/1376749/24115788/e27d818a-0d7a-11e7-8c56-2480e9ae83fb.png) | ![soft-skin](https://cloud.githubusercontent.com/assets/1376749/24115790/e6e548e8-0d7a-11e7-8e2d-d8053e8befd1.png)
  | ![steel-skin](https://cloud.githubusercontent.com/assets/1376749/24115799/eb2108e8-0d7a-11e7-8cc3-a6f22e4082ee.png) |
-| `skin: sea`     | `skin: soft`  | `skin: steel` |
 
 ### Google Fonts