Need to update minimum illuminate/support version to only ^7

[nathanczachur]

Thanks for all the work on this package, its a real time saver!

I have found an issue with the composer.json, it says it works with lower versions of the illuminate/support package, however it doesn't.

If you look here:
https://github.com/tanmuhittin/laravel-google-translate/blob/master/src/TranslationFileTranslators/PhpArrayFileTranslator.php#L59

Str::of()->dirname()

This functionality was added to illuminate/support/Str in version 7.

So, we need to update the composer.json to say we only support version 7. Currently, it shows support from version 5.5 to 7:

laravel-google-translate/composer.json

Line 7 in 2b52183

"illuminate/support": "^5.5|^6|^7",

[nathanczachur]

I have gotten round this by patching that line in my local package, just switching:

Str::of($file)->dirname()

For

dirname($file)

If you wanted to still include support for older versions.