Mantle Versions Save

• Raised the minimum deployment version to iOS 9 and above, courtesy of @mathaeus in #886.
  • While this is technically a breaking change per the rules of semver, we believe that the number of apps still shipping to iOS 8 to be minimal. If this affects you, there is no reason to update yet as there have been no new features. Please do get in touch however.

• Fixed a typecast in #876 courtesy of @thedavidharris.

• Fixes a regression for CocoaPods users that also depend on libextobjc – #872 courtesy of @defagos.

• Adds Swift Package Manager support courtesy of @defagos in #870.

• Binary releases should now be made available to Carthage users automatically (thanks to @3a4oT in #867 )

• Binary releases should now be made available to Carthage users automatically (thanks to @3a4oT in #866),

• Fixed an issue with Xcode 12 #862 – thanks @yhkaplan

• Block definition fix for mtl_cleanupBlock_t (@mogelbuster in #822)
• Suppress documentation warnings for @encode (@Konshin in #785)
• Xcode 10.2 compatibility (@yhkaplan in #834)
• Spring cleaning of libextobjc (@robb in #844)
• Error added for passing nil JSON dictionary to -[MTLJSONAdapter modelFromJSONDictionary:error:](@hashier in #751)
• Cocoapods is now supported officially (@abotkin-cpi in #846)
• GitHub Actions added (@robb in #844 & @dcaunt in #804)
• Carthage updates (@dcaunt in #804 & @alexpezzi in #809)

• watchOS support (@ikesyo in #730)
• tvOS support (@ikesyo in #731)
• Xcode 8 support (@dcaunt in #758)
• Added implicit NSUUID JSON value transformer (@conraddev in #723)

Also includes documentation improvements thanks to @getaaron and @bruun. Thanks to @ikesyo for Xcode/Travis maintenance.

This release contains the same functionality as 1.5.7 but fixes a warning for CocoaPods users (#488).