fallback must be a boolean

[dv336699]

Configuration:

PhpFastCache version: 6.0.1
PHP version: 5.6.30
Operating system: MacOS

Issue description:

I've tried to set files as fallback as described here but got the following

phpFastCache\Exceptions\phpFastCacheInvalidConfigurationException
'fallback must be a boolean' in /src/phpFastCache/CacheManager.php on line 470

CacheManager::setDefaultConfig([
  'fallback' => 'Files',
  'path' => './cache'
]);

[dv336699]

Also described here.

[Geolim4]

Thanks for the report, I'll take a look !

[Geolim4]

This bug is now fixed, thanks for your report.
A dedicated test has been created to prevent any regression:
https://github.com/PHPSocialNetwork/phpfastcache/blob/final/tests/issues/Github-471.test.php

Cheers,
Georges