Make name unique

models/category.js

@@ -1,6 +1,9 @@
 module.exports = (sequelize, DataTypes) => {
 	let Category = sequelize.define('Category', {
-		name: DataTypes.STRING
+		name: {
+			type: DataTypes.STRING,
+			unique: true
+		}
 	})
 
 	return Category