cf_beskin 1.2.1 not compatible with Typo3 7 anymore

[bmorg]

The compatibility information on the TER website still states a compatibility of 7.6.0 - 9.9.99.

However since this change the extension is not compatible with Typo3 7 anymore.

At least the following change will not work in the old version:

-use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper;
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper;