Update the create adapter script to dbt 0.16.1

[beckjake]

resolves #2145

Description

Update the create adapter script to dbt 0.16.1

Make the base dbt version in the script managed by bumpversion

I would love to add a test that this hasn't regressed in a future PR. My current line of thought was:

• run the script to create a sqlite adapter skeleton
• commit that
• build out something that passes dbt debug (implement the missing methods)
• get the diff, store that as a patch
• make a test that runs the script, applies the patch, and ensures dbt debug passes

But that feels like a whole project, and I think we want to get the 0.16.1 rc out. I'm quite happy to do that in this PR if that's deemed reasonable.

Checklist

• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt next" section.

[drewbanin]

LGTM! Let's definitely prioritize the SQLite approach in the future, but no need to hold up 0.16.1 in that regard. Glad we're making this change regardless.

Ship it!