Travis-CIのバッジをSVGに変更しました

Author: nakamura-to

README.md

@@ -1,4 +1,4 @@
-Doma [![Build Status](https://travis-ci.org/domaframework/doma.png?branch=master)](https://travis-ci.org/domaframework/doma) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.seasar.doma/doma/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.seasar.doma/doma)
+Doma [![Build Status](https://travis-ci.org/domaframework/doma.svg?branch=master)](https://travis-ci.org/domaframework/doma) [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.seasar.doma/doma/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.seasar.doma/doma)
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