fix: add validation for view.pattern.uri on view registration

BREAKING CHANGE: `pattern.uri` is now required when registering views

Author: bbartolome

lib/registrars/views.js

@@ -15,7 +15,9 @@ module.exports = function exported(_, async, passport, Joi) {
 			.items(
 				Joi.object({
 					name: Joi.string().required(),
-					pattern: Joi.object().required(),
+					pattern: Joi.object({
+						uri: Joi.string().required()
+					}).required(),
 					handler: Joi.func().arity(3)
 				})
 			);