Merge pull request #22 from JDevZone/dev

#21 bug fixed (nullable listeners)

Merge pull request #20 from JDevZone/dev

#19 bug fixed & versions bumped

Merge pull request #17 from JDevZone/dev

#16 bug fixed & version bumped 😎

Update README.md

Merge pull request #10 from JDevZone/dev

optional progress animation

Merge pull request #8 from JDevZone/dev

gradient support added

Merge pull request #6 from JDevZone/dev

Dev

Merge pull request #4 from JDevZone/dev

Dev

Update README.md