v1.23.1

• Small README typo fix (Thanks to https://github.com/woss)
• Add latest Substrate master types
• Adjust <Codec>.toRawType() to use registry name as available
• Update ProxyType for Kusama, Polkadot & Westend with IdentityJudgement
• Validate number format (signed/unsigned) for number types
• Remove core codec dependencies on Base class (with proper TS encapsulation)
• @polkadot/util 2.17