Schema Validation error with non-empty 'rename' set

[Enormoss]

If config file contains non-empty dictionary for 'rename',
function load_config in config.py throw exception of Schema validation error.

SchemaError: Key 'rename' error:
Wrong keys '836d1983631e' in {'836d1983631e': 'room'}

Solution is to set in config.py key 'rename' to type of 'object' on

bch-gateway/bcg/config.py

Line 49 in b274e77

Optional('rename'): {}

to

 Optional('rename'): object

as is mentioned at https://github.com/keleshev/schema#extra-keys