patch for TableFormatter BUG
nil => "NULL" # OK
true => "true" # OK
false => "NULL" # NG [BUG]
# BEFORE
dbi => \dt test
Table 'test':
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
| name | type_name | precision | scale | default | nullable | indexed | primary | unique |
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
| KEY | TEXT | NULL | NULL | NULL | NULL | NULL | NULL | NULL |
| FLAG | BOOLEAN | NULL | NULL | NULL | true | NULL | NULL | NULL |
| DATA | TEXT | NULL | NULL | NULL | true | NULL | NULL | NULL |
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
# AFTER
dbi => \dt test
Table 'test':
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
| name | type_name | precision | scale | default | nullable | indexed | primary | unique |
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
| KEY | TEXT | NULL | NULL | NULL | false | NULL | NULL | NULL |
| FLAG | BOOLEAN | NULL | NULL | NULL | true | NULL | NULL | NULL |
| DATA | TEXT | NULL | NULL | NULL | true | NULL | NULL | NULL |
+------+-----------+-----------+-------+---------+----------+---------+---------+--------+
|
