Release 0.2 to crates.io

[pimeys]

Sigh, this is kind of a tough one. But it would be great to be able to finally cut a release to crates.io. What's stopping us?

• tokio_postgres doesn't work properly on pgbouncer's transaction mode (https://github.com/sfackler/rust-postgres/pull/636)

Now, we could fork tokio_postgres to our own set of crates, release them to crates.io and cut a release. But that would kind of be horrible idea for maintaining.

The other idea is to complete the SQLx transition (https://github.com/prisma/quaint/issues/138) and related tasks that triggered bugs with certain Postgres types in our quite dynamic setup. This needs some work on their side too.