Fix: Case-insensitive method annotation for placeholder helper

[localheinz]

This PR

• fixes a case-insensitive annotation for the placeholder view helper on PhpRenderer

💁‍♂️ After updating from ZF2 to ZF3, view rendering fails with

Fatal error: Uncaught exception 'Zend\ServiceManager\Exception\ServiceNotFoundException' with message 'A plugin by the name "placeHolder" was not found in the plugin manager Zend\View\HelperPluginManager' in ~/project/vendor/zendframework/zend-servicemanager/src/AbstractPluginManager.php:131 

Stack trace: 

#0 ~/project/vendor/zendframework/zend-view/src/Renderer/PhpRenderer.php(373): Zend\ServiceManager\AbstractPluginManager->get('placeHolder', NULL) 
#1 ~/project/vendor/zendframework/zend-view/src/Renderer/PhpRenderer.php(391): Zend\View\Renderer\PhpRenderer->plugin('placeHolder') 
#2 ~/project/module/Project/view/project/layout/default.phtml(67): Zend\View\Renderer\PhpRenderer->__call('placeHolder', Array) 
#3 ~/project/module/Project/view/project/layout/default.phtml(67): Zend\View\Renderer\PhpRenderer->placeHolder('bodyClass' in ~/project/vendor/zendframework/zend-servicemanager/src/AbstractPluginManager.php on line 131

When modifying the case, PhpStorm complains:

[localheinz]

Thank you, @froschdesign!

[weierophinney]

Thanks, @localheinz

[localheinz]

Thank you, @weierophinney!