Merge pull request #38 from eure/spm

Add SPM support

Merge pull request #37 from eure/swift_version_update

Update .swift_version

1.3.1 release

1.3.0 release:

- Raw support
- Better error handling

1.2.0 release

1.1.1 release

1.1.0 release (iOS 14)

Update pod