Add extra column to test #13 backward-compatibility

#13

tests/testdata/pgkit_test_db.sql

@@ -2,6 +2,7 @@ CREATE TABLE accounts (
   id SERIAL PRIMARY KEY,
   name VARCHAR(255),
   disabled BOOLEAN,
+  new_column_not_in_code BOOLEAN, -- test for backward-compatible migrations, see https://github.com/goware/pgkit/issues/13
   created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP NOT NULL
 );