Fix: Drop support for unsupported versions of rector/rector

[localheinz]

This PR

• drops support for outdated versions of rector/rector
• regenerates files

Replaces #204.

💁‍♂ For reference, see rectorphp/rector#2973 (comment).

[moufmouf]

I'm just starting to realize... Rector 0.6 does not work with any version of PHP anymore, it is completely broken, isn't it?
Because of some dependency issue with a Simplify package?

[moufmouf]

I'm a bit reluctant to remove support for old versions of Rector (we already did that for Rector 0.3 and it caused problems for some users). But of course, if the package is broken for everybody, it shouldn't be a problem.
@Kharhamel what do you think about this?

[localheinz]

@moufmouf

I'm a bit reluctant to remove support for old versions of Rector (we already did that for Rector 0.3 and it caused problems for some users). But of course, if the package is broken for everybody, it shouldn't be a problem.

I wouldn't worry about it:

• rector/rector is not a direct dependency of thecodingmachine/safe
• if anyone wants to use thecodingmachine/safe and at the same time use rector/rector to modify their code, they will be able to find a way, for example: use a dedicated composer.json and a corresponding step that installs the required version of rector/rector, and then runs it

[localheinz]

Thank you, @Kharhamel and @moufmouf!