Upgrade netdisco to 1.3.1

[fabaff]

Description:

Changelog: https://github.com/home-assistant/netdisco/releases/tag/1.3.1

Example entry for configuration.yaml (if applicable):

discovery:

Samsung C410 is detected.

2018-04-07 18:16:21 DEBUG (SyncWorker_14) [homeassistant.components.sensor.syncthru] Discovered a new Samsung Printer: {'host': '192.168.0.5', 'port': 5200, 'ssdp_description': 'http://192.168.0.5:5200/Printer.xml', 'name': 'Samsung C410 Series (192.168.0.5)', 'model_name': 'SECxxxxx5', 'model_number': '1.0', 'serial': 'ZExxxxxxNL', 'manufacturer': 'Samsung Electronics', 'udn': 'uuid:16axxxxxx5'}

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.