Implement use Illuminate\Support\Str

Signed-off-by: crynobone <crynobone@gmail.com>
Revert changes to composer.json.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1' into 2.2

Signed-off-by: crynobone <crynobone@gmail.com>

Conflicts:
	composer.json