Fix the core version validation in generate:module

[tstoeckler]

Currently when running generate:module you get a called to undefined function 8.x because there is an incorrect parameter that is being passed to the Symfony question helper. I implemented some basic validation of the core property.

[jmolivas]

@tstoeckler: Thanks and 👍 for the PR.

Since Drupal Console only supports Drupal 8 and up, this validation should only accept numbers equal and greater than 8.

[tstoeckler]

There you go:

[jmolivas]

Awesome great JIT for the release

[vincenzodibiaggio]

Enter Drupal Core version [8.x]:
 > 8
PHP Fatal error:  Call to undefined function 8.x() in [...]vendor/symfony/console/Helper/SymfonyQuestionHelper.php on line 36
PHP Stack trace:

I not understand, what is the correct value?

[jmolivas]

@vincenzodibiaggio: 8.x is the correct value, I will try using 8 and add comments if found anything.

[tstoeckler]

@vincenzodibiaggio Please update to the latest master, that error should no longer appear