HF20 - Add support and documentation for witness_set_properties #260

Version of Python you are running

2.7.12

Version of steem-python you are running

Latest

Expected Behavior

To be able to use the new witness_set_properties once HF20 is live and find appropriate documentation on it's use.

Actual Behavior

N/A

Steps to reproduce

N/A

Stack Trace

N/A