* Fix bug on text fields size (should be longtext)

[macklus]

this PR change all related text fields on database who can get trouble if you wrote a big email.
also, it fix #36

[thyseus]

+1 for the bugfix - i also ran into the problem with the wrong column datatype.

But there are no columns 'html_body' and 'html_text'. This migration does not work on my system:

*** applying m170510_063111_alter_text_fields
    > alter column html_body in table {{%mail_queue}} to LONGTEXT ...Exception: SQLSTATE[42S22]: Column n
ot found: 1054 Unknown column 'html_body' in 'mail_queue'
The SQL being executed was: ALTER TABLE `mail_queue` CHANGE `html_body` `html_body` LONGTEXT (C:\xampp\ht
docs\hydra\vendor\yiisoft\yii2\db\Schema.php:636)
#0 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\db\Command.php(856): yii\db\Schema->convertException(Object(
PDOException), 'ALTER TABLE `ma...')
#1 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\db\Migration.php(378): yii\db\Command->execute()
#2 C:\xampp\htdocs\hydra\vendor\nterms\yii2-mailqueue\migrations\m170510_063111_alter_text_fields.php(11)
: yii\db\Migration->alterColumn('{{%mail_queue}}', 'html_body', 'LONGTEXT')
#3 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\db\Migration.php(96): m170510_063111_alter_text_fields->safe
Up()
#4 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\console\controllers\BaseMigrateController.php(654): yii\db\M
igration->up()
#5 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\console\controllers\BaseMigrateController.php(166): yii\cons
ole\controllers\BaseMigrateController->migrateUp('m170510_063111_...')
#6 [internal function]: yii\console\controllers\BaseMigrateController->actionUp(0)
#7 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\base\InlineAction.php(57): call_user_func_array(Array, Array
)
#8 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\base\Controller.php(156): yii\base\InlineAction->runWithPara
ms(Array)
#9 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\console\Controller.php(128): yii\base\Controller->runAction(
'up', Array)
#10 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\base\Module.php(523): yii\console\Controller->runAction('up
', Array)
#11 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\console\Application.php(180): yii\base\Module->runAction('m
igrate/up', Array)
#12 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\console\Application.php(147): yii\console\Application->runA
ction('migrate/up', Array)
#13 C:\xampp\htdocs\hydra\vendor\yiisoft\yii2\base\Application.php(380): yii\console\Application->handleR
equest(Object(yii\console\Request))
#14 C:\xampp\htdocs\hydra\yii(20): yii\base\Application->run()
#15 {main}
*** failed to apply m170510_063111_alter_text_fields (time: 0.004s)

This migration does remove the columns:

https://github.com/nterms/yii2-mailqueue/blob/master/migrations/m170217_124201_drop_obsolete_columns_from_mail_queue_table.php

are you sure this is working as expected? @macklus @nterms