Remove obsolete requirement

zend-filter and zend-i18n are not required anymore. This also prevents the component installer asking questions when creating a new project with the skeleton. Assuming PR zendframework/zend-expressive-skeleton#54 will be merged.

Author: geerteltink

composer.json

@@ -23,8 +23,6 @@
         "psr/http-message": "^1.0",
         "zendframework/zend-expressive-helpers": "^1.1 || ^2.0",
         "zendframework/zend-expressive-template": "^1.0.1",
-        "zendframework/zend-filter": "^2.6.1",
-        "zendframework/zend-i18n": "^2.6",
         "zendframework/zend-servicemanager": "^2.7.5 || ^3.0.3",
         "zendframework/zend-view": "^2.8.1"
     },