[Ruby-DBI-devel] patch for dbi/utils.rb

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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   |
  +------+-----------+-----------+-------+---------+----------+---------+---------+--------+