Integrate v2 endpoints

[JacobPlaster]

Description:

Adds new V2 endpoints to the lib:

 `/v2/auth/w/order/submit` (same data used in sending orders through WS, `on`)
  `/v2/auth/w/order/update`  (same data used in sending orders through WS, `ou`)
  `/v2/auth/w/order/cancel` (same data used in sending orders through WS, `oc`)
  `/v2/auth/w/order/multi`  (same data used in sending orders through WS `ox_multi`, but inside an array called `ops`, ie. `{"ops": [["on", {"symbol": "tBTCUSD", "amount": "5", "type": "LIMIT", "price": "10"}]]}`)
  `/v2/auth/w/order/cancel/multi` (same data used in sending orders through WS, `oc`)
  `/v2/auth/w/position/claim` (params: `id`)
  `/v2/auth/w/funding/offer/submit` (same data used in sending orders through WS, `on`)
  `/v2/auth/w/funding/offer/cancel` (same data used in sending orders through WS, `on`)
  `/v2/auth/w/funding/close` (params: `id`, `type` (credit|loan))
  `/v2/auth/w/funding/auto` (params: `status` (1|0), `currency`, `amount`, `rate`, `period`) (`rate === 0` means `FRR`)
  `/v2/auth/w/transfer` (params: `from`, `to`, `currency`, `currency_to`, `amount`)
  `/v2/auth/w/deposit/address` (params: `wallet`, `method`, `op_renew`(=1 to regenerate the wallet address))
  `/v2/auth/w/withdraw` (params: `wallet`, `method`, `amount`, `address

Breaking changes:

Originally the lib forwarded any calls to rest2.withdraw and rest2.transfer to the v1 endpoint but since the v2 endpoints for these actions require different params then anyone using the old param style will encounter an error. To solve this I have bumped the major version of the lib

• legacy V1 routing (see above)

New features:

• rest2.withdraw
• rest2.getDepositAddress
• rest2.transfer
• rest2.submitAutoFunding
• rest2.closeFunding
• rest2.cancelFundingOffer
• rest2.submitFundingOffer
• rest2.claimPosition
• rest2.cancelOrder
• rest2.updateOrder
• rest2.submitOrder

Fixes:

None

PR status:

• Version bumped
• Change-log updated

[f3rno]

lgtm 👍