fix(api-addresses): Main isn't required when updating an address (#695)

Author: louis-lau

lib/api/addresses.js

@@ -879,7 +879,7 @@ module.exports = (db, server, userHandler, settingsHandler) => {
                         .description(
                             'New address if you want to rename existing address. Only affects normal addresses, special addresses that include * can not be changed'
                         ),
-                    main: booleanSchema.required().description('Indicates if this is the default address for the User'),
+                    main: booleanSchema.description('Indicates if this is the default address for the User'),
                     tags: Joi.array().items(Joi.string().trim().max(128)).description('A list of tags associated with this address'),
 
                     metaData: metaDataSchema.label('metaData').description('Optional metadata, must be an object or JSON formatted string'),