isLumen() fixes

[0xb4lint]

isLumen() regex was invalid and it should be used too where isLaravel() is used
Please merge to 2.5 and 2.6 branches.

[jgrossi]

Hi @valentinxxx thanks for the PR. Actually I just figured out that isLumen() is not being used. Maybe we could include the isLumen() logic into isLaravel(). There's no place where isLumen() is called without isLaravel(). Maybe something like:

public static function isLaravel()
{
    return function_exists('app') &&
        (app() instanceof Application ||
            preg_match('/^Lumen/', app()->version()) === 1);
}

What do you think?

[0xb4lint]

@jgrossi You're right. I've modified the code and also replaced preg_match() with strpos()

[jgrossi]

@valentinxxx thank you! and thanks for contributing! 😎

[jgrossi]

@valentinxxx merged into 2.6 as well and created new release for both versions 🎉🍻