feat(core): Add normalized() helper to Assertion base class

[JoseLion]

This helper will allow classes extending from Assertion to create matcher methods which don't need the this.execure(..) method:

public someMatcher(): this {
  if (this.inverted) {
    // ...assert inverted somehow
  } else {
    // ...assert somehow
  }

  return this.normalized();
}

[ChristianSama]

Suggested change

	* A convenience method to normalized the assertion instance. If it was
	* A convenience method to normalize the assertion instance. If it was

Typo

[ChristianSama]

LGTM!

[github-actions]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀