Remove mockito as compile dependency from release 0.5

[victorcampos]

Hi, I have just bumped into a strange case in mockito (as I was using mockito 2) and it seems to be related to jira-client setting mockito 1.9 as a compile dependency.

I've checked and on master there are no entries in pom.xml regarding mockito but it is present in the 0.5-release tag, would it be possible to release a 0.5.1 fixing that? I have added an exclusion for it in my pom.xml but was caught off guard.