shimataro

#346 [Granite v5.2](https://github.com/elementary/granite/tree/5.2.0/lib/Widgets) does not have `AccelLabel`, and [v5.3](https://github.com/elementary/granite/tree/5.3.0/lib/Widgets) has it!

* prepend key of `github.com` to `known_hosts` * make `known_hosts` optional

This PR adds dependencies for Gentoo Linux. Release Notes: - N/A

Feature/union

1

resolves #425

Union type

1

Like this: ```javascript import assert from "assert"; import vs from "value-schema"; // accepts both number and integer const schema = vs.union({ schemas: [vs.number(), vs.string()], }); assert.strictEqual(schema.applyTo(1), 1); assert.strictEqual(schema.applyTo("a"), "a"); ```