pgsql: added 'bool' type (alias of 'boolean')

Relates #1086 and #1087

framework/yii/db/pgsql/Schema.php

@@ -34,6 +34,7 @@ class Schema extends \yii\db\Schema
 	public $typeMap = [
 		'abstime' => self::TYPE_TIMESTAMP,
 		'bit' => self::TYPE_STRING,
+		'bool' => self::TYPE_BOOLEAN,
 		'boolean' => self::TYPE_BOOLEAN,
 		'box' => self::TYPE_STRING,
 		'character' => self::TYPE_STRING,