0.4.0

Bug Fixes

• logging: use lock for multi threading (749e1c7)
• subscription-status: surpress error when subscribing without token (c86daca)

Features

• authentication: request authentication token from rest api (43c3d7d), closes #41
• open-orders: handle open order messages from websocket (7fcb607)
• own-trades: deserializing data from socket (416ead7)
• private-message: separate logic for private data from data (2e47eb7)
• subscription: provide authentication token for private data (34c658f)