message: Add: `purser-core` SIGN_TRANSACTION default deprecation
diff: @@ -133,6 +133,14 @@ export const NETWORK_IDS: Object = {
  * Prop names used to validate user input against
  */
  export const REQUIRED_PROPS: Object = {
  + /*
  + * @NOTE SIGN_TRANSACTION default value deprecation
  + * The transactions signature object requirements have been dropped (with the
  + * exception of Trezor) so this default will be removed once every module has
  + * been migrated
  + *
  + * @TODO Remove deprecated SIGN_TRANSACTION value
  + */
  SIGN_TRANSACTION: ['to', 'nonce', 'value'],
  SIGN_MESSAGE: ['message'],
  VERIFY_MESSAGE: ['message', 'signature'],
  