fix bug 638

[GCarneiroA]

Fix #638

[eullercdr]

@GCarneiroA this repository is using by many peoples, and projects. Can you update your code, checking the compatibility between all versions of laravel? Thanks

[trungtrandinh198]

@GCarneiroA this repository is using by many peoples, and projects. Can you update your code, checking the compatibility between all versions of laravel? Thanks

I see this problem with laravel 6,

[mattford]

There are a lot of other references to those functions throughout the lib, it'd probably be better to cover all of them if possible, hopefully the Str::xxx version of the fn's are supported in historical versions of Laravel.

The short term workaround is to add laravel/helpers as a dependency to projects which are using l5-repository

[bsormagec]

Fixed #625