Fix logs format

[layderv]

Running your hello world in your README the first time,

> cat hello.ts
import { hello } from "https://x.nest.land/arweave-hello@0.0.2/mod.ts";

hello("Elsa");

> elsa run hello.ts
Hello, Elsa

The output is:

Downloading: https://x.nest.land/arweave-hello@0.0.2/mod.ts => /tmp/x.nest.land/arweave-hello@0.0.2/mod.ts%!(EXTRA []interface {}=[])Hi Elsa!

This PR fixes the call with the format string and adds a newline to the log. Output:

Downloading: https://x.nest.land/arweave-hello@0.0.2/mod.ts => /tmp/x.nest.land/arweave-hello@0.0.2/mod.ts Hi Elsa!