onmessage 0.2.0

A stream wrapping JavaScript's `window.onmessage` that is safe to import even on platforms other than web.

0.2.0

• BREAKING: Hidden constructors for the platform implementation classes to only use singletons.
• Improved doc comments.
• Use total_lints.

0.1.3

• Fix formatting.

0.1.2

• Overridden MessageEvent.toString() to show all fields.
• Added an example.
• Added analysis_options.yaml.
• Re-licensed under MIT No Attribution.

0.1.1

• Exposed MessageEvent.source, MessageEvent.ports.
• Improved docs.

0.1.0

• Initial release.