Force user to set TYPO3 dependency
Due to the fact that a TYPO3 dependency will be a mandatory setting in file
ext_emconf.php according to  and , ext:kickstarter should the user to define these values.
I understand, that TER will reject attempts of uploading an extension without these settings.
The following validation policy (text derived from ) would also be useful, but maybe too complex to implement:
The minimum version of the TYPO3 dependency can be set to a version of TYPO3 which is not supported any more (e.g. a deprecated version). The maximum version must be within the supported range. You cannot set a maximum version outside the range of supported versions. Both versions should show three numbers, separated by dots (x.y.z).