Allow overriding default tag

[abemedia]

I'm currently working on a project that uses json as the default tag for sqlx. I've resorted to overriding every single function, however this is quite unwieldy.

How would you feel about a new option to override tags? I'm thinking something like this:

tags:
  db: yaml

I'd be happy to contribute the change if this is something you'd accept.

[tmzane]

Hi, sorry for the late reply.

Sounds good, I'd be glad to accept your contribution!

Let's name it tag-overrides to make it more clear.