fix .travis.yml
```
java.lang.RuntimeException: Setting value cannot be null: {file:/home/travis/build/takezoe/gitbucket/}gitbucket/*:version
	at scala.sys.package$.error(package.scala:27)
	at sbt.EvaluateSettings$INode.setValue(INode.scala:143)
	at sbt.EvaluateSettings$MixedNode.evaluate0(INode.scala:175)
```
1 parent 8f4e285 commit 2e58f82a612babf8e56677b50cad58bdb35f4d87
@xuwei-k xuwei-k authored on 31 May 2015
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.travis.yml