Avoid duplicate builds by only building pushes to master, because PRs are already handled by PR builds (#50)

Author: fbenz

.travis.yml

@@ -7,4 +7,8 @@ jdk:
 before_install:
   - mvn install:install-file -Dfile=lib/spring-restdocs-core-1.1.2.RELEASE-test.jar
     -DgroupId=org.springframework.restdocs -DartifactId=spring-restdocs-core
-    -Dversion=1.1.2.RELEASE -Dpackaging=jar -Dclassifier=test
+    -Dversion=1.1.2.RELEASE -Dpackaging=jar -Dclassifier=test
+
+branches:
+  only: 
+    - master