Couchdb package is deprecated

The repo uses `CouchDB` and looks like it is no longer maintained.

You can find more information here - https://github.com/djc/couchdb-python/

The project suggests using [python-cloudant](https://github.com/cloudant/python-cloudant), which is also **deprecated will be end-of-life on Dec 31 2021**. It in turn points to [cloudant-python-sdk](https://github.com/IBM/cloudant-python-sdk). This last library is in `pre-release` version right now.

@josiemundi, what are your thoughts? I would like to use a library that works with both cloudant and couchdb. Ideally, we move to `cloudant-python-sdk`, but that is still in pre-release.

**Option 1**: move to `python-cloudant` at this time till Dec 31, 2021. Revisit the issue then.

**Option 2**: move to the pre-release version of `cloudant-python-sdk`.