Feature/url v1 opt

[vigan-abd]

Description:

This PR fixes the issues in api/v1 calls that are done through RESTv2 with url https://api-pub.bitfinex.com. A simple case when this occurs is callinge symbolDetails action which returns forbidden in case of api-pub subdomain:

• https://api-pub.bitfinex.com/v1/symbols_details - error 403
• https://api.bitfinex.com/v1/symbols_details - success

To solve this issue we added an additional option in RESTv2 constructor named urlV1 which would be used when calling the underlying RESTv1 property. This property is optional so it will be compatible with previous versions since it falls back to url option.

Usage example:

const { RESTv2 } = require('bfx-api-node-rest')
const rest = new RESTv2({
  transform: true,
  url: 'https://api-pub.bitfinex.com',
  urlV1: 'https://api.bitfinex.com'
})

const run = async () => {
  const symbols = await rest.symbolDetails()

  console.log('recv %d symbols', symbols.length)
  console.log('first five: %s', JSON.stringify(symbols.slice(0, 5), null, 2))
}

run().catch(e => debug('error: %s', e.stack))

Breaking changes:

• N/A

New features:

• urlV1 option in RESTv2 constructor

Fixes:

• Fix errors thrown when using api-pub in RESTv1 through RESTv2

PR status:

• [X] Version bumped
• [X] Change-log updated
• [ ] Tests added or updated
• [X] Documentation updated

[vigan-abd]

Decided to migrate api/v1 to api/v2 calls