add badge.

ravenq · web-flow · commit c3f47ef8c27d · 2019-01-24T14:46:49.000+08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,8 @@
 # markdown-it-vue
-The vue lib for markdown-it.
+
+[![Build Status](https://travis-ci.org/ravenq/markdown-it-vue.svg?branch=master)](https://travis-ci.org/ravenq/markdown-it-vue)
+
+> The vue lib for markdown-it.
 
 ## Demo online
 
