Update README.md

I struggled for a moment to find out why my Jobs couldn't be found by dropwizard-jobs. Forgive me my wording. I come from .NET world and I don't know if this is exact technically true (that Jobs are searched only in the current package), but the point is you can pass jobs package location as a Bundle argument.
Merge pull request #3 from tomaszkubacki/patch-2

Update README.md to include package bundle