Remove println from PullOp

[jthurne]

Line 97 of PullOp has an unhelpful println. The JGit PullResult class does override toString, but its members (FetchResult, MergeResult, and RebaseResult) do not. When PullOp is executed, something similar to:

org.eclipse.jgit.transport.FetchResult@db188ae6
org.eclipse.jgit.api.RebaseResult@e7b8848a

...is printed to standard out. This is rather annoying when you are trying to use Grgit in a console-based application.

To fix the issue, please delete the println.

[ajoberstar]

Agreed. I'll put this in the next release.