setup: rename `CONTRIBUTING` to `CONTRIBUTING.rst`

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
test: no empty instructions

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
dictdiffer: fix for empty list instructions

* Addresses an issue when `reversed` iterator was evaluated as `True`
  causing empty instruction set to appear.  (closes #30)

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