Specify dependency version

Update Example to Swift 5

3.0.0-beta-swift-4-2

Version 2.0.0 Release

Merge pull request MessageKit#910 from MessageKit/version2.0.0

Release MessageKit 2.0.0-beta1

Merge pull request MessageKit#742 from MessageKit/development

Release 1.0.0

Merge pull request MessageKit#728 from MessageKit/development

Release MessageKit 1.0.0-beta.2

Merge pull request MessageKit#666 from MessageKit/development

MessageKit 1.0-beta

Update for release 0.13.5