Podspec swift version must be updated. #111

Hi Dears,
The framework's swift version has been updated to 5.0. however, the swift version in pospec needs to be updated to the latest swift version.

the pod install might face the error where Podfile has specified swift version support.
supports_swift_versions '>= 5.0'

[!] Unable to determine Swift version for the following pods:

- `MagazineLayout` does not specify a Swift version (`4.0`) that is satisfied by any of targets integrating it.

please update the swift version in pod spec file.