Start the process to support Laravel 7

[grantholle]

All the tests except for DatabaseProviderTest::auth_attempts_fallback_using_config_option work and I've resolved the warnings around @expectedException annotations. I can't quite tell what's going on. I think it's because AdLdap2 is throwing exceptions when before it only returned null or something? I wouldn't mind taking it on, but could use some direction on how you want to handle it.

This would close #852 and probably mean a new version? Again, some direction would be helpful if you want some help on it. I've set the adldap2/adldap2 dependency to be dev-master because I saw you did some work on supporting 7 today.

Let me know!

[rimace]

Laravel 6.0 is an LTS version. It would be nice if the LTS version would still be supported.

[grantholle]

Yeah I agree supporting 6 would be ideal as well. orchestra/testbench v5 supports 7 but not 6. I don't know if that would hold it back from supporting both versions of Laravel?

[stevebauman]

@rimace There should be no issues supporting Laravel 5.5 and greater (up to Laravel 7.0).

[stevebauman]

Can't merge this due to requiring dev-master. I need to finish cleaning some things in the core Adldap2 package and make a new release so Laravel 7.0 is supported properly.