docs: use SVG badges

Author: sparanoid

README.md

@@ -1,4 +1,4 @@
-# Path 2.0 Flyout Menu [![Build Status](https://travis-ci.org/sparanoid/path-menu.png)](https://travis-ci.org/sparanoid/path-menu) [![devDependency Status](https://david-dm.org/sparanoid/path-menu/dev-status.png)](https://david-dm.org/sparanoid/path-menu#info=devDependencies)
+# Path 2.0 Flyout Menu [![Build Status](https://travis-ci.org/sparanoid/path-menu.svg)](https://travis-ci.org/sparanoid/path-menu) [![devDependency Status](https://david-dm.org/sparanoid/path-menu/dev-status.svg)](https://david-dm.org/sparanoid/path-menu#info=devDependencies)
 
 Path 2.0 Flyout Menu using CSS (LESS), contributed to Path by Tunghsiao Liu
 
@@ -11,4 +11,4 @@ Path 2.0 Flyout Menu using CSS (LESS), contributed to Path by Tunghsiao Liu
 
 ## License
 
-MIT
+MIT