PHP71 Compatibility

Hi,

I’ve got some error with php71 (7.1.8).

Fatal error: Uncaught Error: [] operator not supported for strings in /Users/penyo/Sites/domain.dev/wp-content/themes/v8/lib/mobble.php:261 Stack trace: #0 /Users/penyo/Sites/domain.dev/wp-content/themes/v8/lib/mobble.php(191): mobble_body_class('') #1 /Users/penyo/Sites/domain.dev/wp-content/themes/v8/base.php(14): mobble_class() #2 /Users/penyo/Sites/domain.dev/wp-includes/template-loader.php(74): include('/Users/penyo/Si...') #3 /Users/penyo/Sites/domain.dev/wp-blog-header.php(19): require_once('/Users/penyo/Si...') #4 /Users/penyo/Sites/domain.dev/index.php(17): require('/Users/penyo/Si...') #5 {main} thrown in /Users/penyo/Sites/domain.dev/wp-content/themes/v8/lib/mobble.php on line 261

Thanks.