Fix code formatting in README

Author: mcgin

README.md

@@ -7,8 +7,11 @@ See details on [wiki](https://wiki.jenkins-ci.org/display/JENKINS/BitBucket+Plug
 
 # Job DSL
 The plugin supports the following dsl extension to enable bitbucket pushes to trigger a build:
-```freeStyleJob('test-job') {
+
+```
+freeStyleJob('test-job') {
   triggers{
     bitbucketPush()
   }
-}```
+}
+```