Allow selecting an alternative default database with postgres

[georgepstaylor]

Digital Ocean managed postgres database servers use 'defaultdb' instead of postgres.
This should be allowed to be changed, rather than hard coded

[kurtmckee]

@georgepstaylor It looks like your system may have run black against the file when you made changes to it (black is not yet used for code linting, but may be introduced in the future). For now, this has made the functional changes significantly more difficult to understand, because they are obscured by a much bigger diff than is needed.

Would you be willing to isolate the functional changes and resubmit? If you're not comfortable rewriting git history and force-pushing to GitHub, you might need to create a new branch.

[georgepstaylor]

@kurtmckee, you are correct - apologies didn't catch that! I will resubmit

[georgepstaylor]

@kurtmckee, all sorted - diff looks much easier to read!

[georgepstaylor]

Hi, is this repo still actively maintained?