Use SVG Travis badge over PNG

* README.md: Use SVG Travis badge over PNG for better quality and
  devise support.  [Fix GH-1214] [Fix GH-1216]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 7983cdc48a..c19b54ffcf 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/ruby/ruby.png)](https://travis-ci.org/ruby/ruby)
+[![Build Status](https://travis-ci.org/ruby/ruby.svg)](https://travis-ci.org/ruby/ruby)
 [![Build status](https://ci.appveyor.com/api/projects/status/0sy8rrxut4o0k960/branch/trunk?svg=true)](https://ci.appveyor.com/project/ruby/ruby/branch/trunk)
 
 # What's Ruby