Release v0.12.0

Minor release that changes the errors returned by proteus.Build to include any errors caused by badly formed function struct fields.

Also, the tests no longer require sqlite, which greatly speeds them up. If you want to run the tests, a docker-compose.yml file is included that stands up a Postgres Docker image. The new Makefile starts it when you invoke make test

The README has been updated to clarify that using context.Context is preferred.