docs: usage example update WRT empty list removals

* Updates canonical usage example after removal of empty list
  instructions.  (addresses #30)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
MANIFEST: addition of test files

* Adds test files and `RELEASE-NOTES.rst` to `MANIFEST.in`.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
Dictdiffer v0.2.0

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>