Error when configuring the module (form setting filename does not match with routing)

In youtubechannel.routing.yml, the filename is lower case:
_form: '\Drupal\youtubechannel\<strong>y</strong>outubechannelSettingsForm'

However, the file itself is upper case: YoutubechannelSettingsForm.php

Proposed fix: lower case this file in the package.