v0.0.2 Websocket Server

What's Changed

• implement basic websocket server by @formiat in #51
• coin_average_price subscription by @formiat in #53
• Two tasks: coin_exchange_price AND coin_exchange_volume by @formiat in #54
• Refactoring and Tests by @formiat in #55
• add "method" field to json rpc response by @formiat in #59
• Calculate exchange volumes in USD by @formiat in #60
• BUGFIX: exchange volumes by @formiat in #64
• Dev by @andskur in #65

Full Changelog: v0.0.1...v0.0.2