update versions

Author: yaroot

README.md

@@ -29,6 +29,7 @@ site generators ([jekyll](http://jekyllrb.com/), [hugo](https://gohugo.io/), etc
 
 | pages version | gitbucket version |
 |     :---:     |       :---:       |
+| 0.8           | 4.6               |
 | 0.7           | 4.3 ~ 4.6         |
 | 0.6           | 4.2.x             |
 | 0.5           | 4.0, 4.1          |