Fix package platforms versions to support `Identifiable` protocol (#66)

Fixed instant color change of node (#62)

Fixed node color animation (#60)

SKColor updates fix and tests (#51)

#48 build errors fix (#49)

* BoneKeyframeShearModel build errors fix

* Skeleton+Points build error fix

V3 (#46)

Spine library 3.0 (breaking changes implemented):

reorganised into a SMP Package
updated json deserialisation to Spine App 4.1.0
updated library public API in general
improved skins related public API
fixed animations with Bézier curves
fixed multiple minor bugs
updated tests
updated documentation
Cocoa pods support depicated

Update Spine.podspec

Merge pull request #31 from maxgribov/develop

Animation stepped timingFunction fix

Merge pull request #21 from maxgribov/develop

Swift 5.0 migration

Merge pull request #13 from maxgribov/develop

Slot animation bug fix