Fix type of self

Author: remcohaszing

lib/index.js

@@ -163,7 +163,7 @@
  *   `jsxs` or `jsx` would be used.
  * @param {Source} [source]
  *   Info about source.
- * @param {any} [self]
+ * @param {unknown} [self=unknown]
  *   Nothing (this is used by frameworks that have components, we don’t).
  * @returns {ReturnType<JsxFunction>}
  *   Element from your framework.