Release v1.5.0

This release is an update to make the validator non-permissive.

What's Changed

• Added a contract to manage candidate validators by @ironbeer in #29
• Deleted validator allowlist by @ironbeer in #30
• Prohibited reuse of the operator address by @ironbeer in #31
• Added reentrancy guard to OASMultiTransfer by @ironbeer in #32
• Add comment by @ironbeer in #33
• Deleted unused contracts by @ironbeer in #34
• Update for validator v1.1.0 by @ironbeer in #35
• Add initial candidate validator by @ironbeer in #37

Full Changelog: v1.4.0...v1.5.0