add ./v2 to gitignore

tutorials/code/blog/blog.sql

@@ -0,0 +1,22 @@
+create database blog;
+
+\c blog
+
+drop table articles;
+
+create table articles (
+	id serial primary key,
+	title text default '',
+	text text default ''
+);
+
+insert into articles (title, text) values (
+	'Hello, world!',
+	'V is great.'
+);
+
+insert into articles (title, text) values (
+	'Second post.',
+	'Hm... what should I write about?'
+);
+