New migration: inserted parent column on groups table

.eslintignore

-db/migrations/
 db/seeds/
 build/
 node_modules/

db/migrations/20180301104213_insert_parent_column.js

+
+exports.up = function(knex, Promise) {
+    return knex.schema.table('groups', function(t) {
+        t.integer('parent');
+    });
+};
+
+exports.down = function(knex, Promise) {
+    return knex.schema.table('groups', function(t) {
+        t.dropColumn('parent');
+    });
+};