message: Adding in docs
diff: @@ -14,3 +14,23 @@ a Rust-generated WebAssembly project.
  [build]: ./build.html
  [new]: ./new.html
  [pack-pub]: ./pack-and-publish.html
  +
  +### Log levels
  +
  +By default `wasm-pack` displays a lot of useful information.
  +
  +You can cause it to display even *more* information by using `--verbose`, or you can silence *all* stdout by using `--quiet`.
  +
  +You can also use `--log-level` to have fine-grained control over wasm-pack's log output:
  +
  +* `--log-level info` is the default, it causes all messages to be logged.
  +* `--log-level warn` causes warnings and errors to be displayed, but not info.
  +* `--log-level error` causes only errors to be displayed.
  +
  +These flags are global flags, so they can be used with every command, and they must come *before* the command:
  +
  +```sh
  +wasm-pack --log-level error build
  +wasm-pack --quiet build
  +wasm-pack --verbose build
  +```
  