Added vacuum to CLI and Python API

tests/test_cli.py

@@ -21,3 +21,8 @@ def db_path(tmpdir):
 def test_table_names(db_path):
     result = CliRunner().invoke(cli.cli, ["table_names", db_path])
     assert "Gosh\nGosh2" == result.output.strip()
+
+
+def test_vacuum(db_path):
+    result = CliRunner().invoke(cli.cli, ["vacuum", db_path])
+    assert 0 == result.exit_code

tests/test_create.py

@@ -176,3 +176,8 @@ def test_create_view(fresh_db):
     fresh_db.create_view("bar", "select bar from data")
     rows = fresh_db.conn.execute("select * from bar").fetchall()
     assert [("bar",)] == rows
+
+
+def test_vacuum(fresh_db):
+    fresh_db["data"].insert({"foo": "foo", "bar": "bar"})
+    fresh_db.vacuum()