The code coverage now covers all exchanges that can be run in the US. A minor bug-fix on Huobi FUTURES have been fixed in the process.

The test-getQuote.R has been expanded to include ALL intervals. The get_quote()-function
has been wrapped in try() as testthat doesn't capture the error per se.

Various bugs have been captured in this process:

1. Binance Futures doesn't have a 1s interval.
2. Bitmart doesn't have a 3m, 6h or 3d interval. However, the
documentation clearly states that it has. The URLs have been pasted directly
into the browser to verify this - its a but on their side.

Note:

This commit closes #26

This commit is a conflict-resultion commit and push. The original commit is d527349