Add retry on upload files

Added a retry of up to 3 times in case of an error when uploading files to pCloud

Full Changelog: 1.0.5...1.0.8

Make ClearLocalStorage command

Make ClearLocalStorage command to clean local storage from file download from pCloud

Added new methods

make 'get' and 'readStream' methods.

BugFix default api key

1.0.3

BugFix default api key

Laravel Flysystem for pCloud

Merge pull request #1 from LucaF87/dev

Dev