Update time 0.3 and postgres 0.19

[oherrala]

This PR updates two dependencies: time to version 0.3 (yay!) and postgres to 0.19.

[bradfier]

Postgres 0.19 requires Rust 1.46 due to depending on rust-lang/rust#49146

Other than bumping some very old dependencies (which I'm 100% on-board with!) does this upgrade buy us anything that would justify increasing our MSRV?

[oherrala]

@bradfier Oh, I didn't know about the version dependency.

But for me, the master branch doesn't build any more so I chose the easy way out by just updating the dependency:

% cargo test
    Updating crates.io index
error: failed to select a version for the requirement `hmac = "^0.1"`
candidate versions found which didn't match: 0.11.0, 0.10.1, 0.10.0, ...
location searched: crates.io index
required by package `postgres-protocol v0.3.0`
    ... which is depended on by `postgres v0.15.2`
    ... which is depended on by `rouille v3.2.1 (/Users/oherrala/tmp/rouille)`

Is the postgres really needed at all? It feels like massive dependency to have for testing one example.

[bradfier]

But for me, the master branch doesn't build any more so I chose the easy way out by just updating the dependency:

Thanks for this, it's frustrating that the version of HMAC that we depended on has been yanked, such is the state of dependencies in Rust I suppose!

Is the postgres really needed at all? It feels like massive dependency to have for testing one example.

That's a fair point, I'd accept a PR that removes it (maybe swapping for some equivalent but lighter DB connector), or replaces that documentation example with something equivalent.

[bradfier]

@oherrala thanks for this! I ended up bumping the MSRV as debian dropped 1.41 and merged your updates as 8075ccc

[oherrala]

@bradfier Thanks!