[BUGFIX] Do not require meta package `typo3/minimal`
[BUGFIX] Do not require meta package `typo3/minimal`

Do not require the meta package `typo3/minimal` but require
the packages that are really required by the package itself.

Do also add a suggestion to install `typo3/testing-framework`
as it is required by the bootstrap.

Fixes #3

sascha-egerer/phpstan-typo3