Use SVG badges (#406)

Use SVG badges (#406)

diff --git a/README.md b/README.md
index 721b38a..e892881 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 onebox
 ======
 
-[![Gem Version](https://badge.fury.io/rb/onebox.png)](https://rubygems.org/gems/onebox)
-[![Code Climate](https://codeclimate.com/github/dysania/onebox.png)](https://codeclimate.com/github/dysania/onebox)
-[![Build Status](https://travis-ci.org/discourse/onebox.png)](https://travis-ci.org/discourse/onebox)
+[![Gem Version](https://badge.fury.io/rb/onebox.svg)](https://rubygems.org/gems/onebox)
+[![Code Climate](https://codeclimate.com/github/dysania/onebox.svg)](https://codeclimate.com/github/dysania/onebox)
+[![Build Status](https://travis-ci.org/discourse/onebox.svg)](https://travis-ci.org/discourse/onebox)
 
 Onebox is a library for turning media URLs into simple HTML previews of the resource.

GitHub sha: 5b31a38e

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