gitflow.GitflowVersionTester holds disposed Project

```
(root): java.lang.Class(gitflow.GitflowVersionTester)
(static): java.util.concurrent.ConcurrentHashMap
table: java.util.concurrent.ConcurrentHashMap$Node[]
[]: java.util.concurrent.ConcurrentHashMap$Node
key: com.intellij.openapi.project.impl.ProjectImpl (disposed)
```