v1.4.1

• Breaking change To set the ss58Format, you should now use setSS58Format as opposed to the old setAddressPrefix
• Renamed keyring.setAddressPrefix to keyring.setSS58Format
• Deprecated addressPrefix on the keyring options, added the ss58Format as a replacement (aligning with chain properties - the old version is still accepted)
• Added stringToHex and hexToString conversion utilities to @polkadot/util