v2.0.0-alpha.4

What's Changed

This is the fourth alpha release for version 2. See v2.0.0-alpha.1 for an introduction.

• Remove addListItem and setMapEntry from ReflectMessage by @timostamm in #875
• Relax validation in BinaryWriter by @timostamm in #877

Full Changelog: v2.0.0-alpha.3...v2.0.0-alpha.4