v4.0.0b3

What's Changed

• update definitions, rename MPTokenHolder to Holder, remove LockedAmount
• Validate the serialization of maximum UINT64 value OracleSet txn by @ckeshava in #756
• Add include_deleted param to ledger_entry API by @Kassaking7 in #721
• Updates to FeeSettings ledger object by @ckeshava in #758
• fix: docs build by @justinr1234 in #761
• fix: read the docs build by @justinr1234 in #762
• Update CHANGELOG.md by @dangell7 in #748
• Use Github-Actions for PyPI release process by @ckeshava in #760

Full Changelog: v4.0.0b2...v4.0.0b3