two warnings

[masterkain]

elixir 1.8.x, poison 4

remote: warning: module attribute @api_testnet_host was set but never used
remote:   lib/bitmex/rest/http_client.ex:9
remote:
remote: warning: function Poison.Parser.parse/1 is undefined or private. Did you mean one of:
remote:
remote:       * parse!/2
remote:
remote:   lib/bitmex/websocket/parser.ex:40

[nobrick]

The second warning seems to be caused by the undocumented API changes in poison 4.0. I've submitted a PR to it. Meanwhile, I'm updating bitmex to use Poison.decode/1 for now instead of the removed function in Poison.Parser.