main -> dev for version updater

…322)

* Allow empty 'payload' field in response handle event

* When payload is not in response handle, do not include in event

* Remove deprecated class XDMFormatters

* Update timestamp field in MobileSDKCommerceSchema in tutorial apps

…nsion version Bump to 4.0.0 (#344)

* Update Min supported version to iOS 11 and tvOS 11. Bump major extension version.

* Clean Makefile and add steps to generate xcframeworks

* Update Github release workflow to add XCframework with the release

* Add ci steps back in Makefile

* Fix Github workflow steps

* Updates based on reviews

* More review updates

* Update README

* Add version to the release artifact

* Update the getting started doc

* Add test command in Makefile to run ios and tvos tests

* Update makefile

* Add commands to remove exisiting coverage reports before running the tests

* Update Makefile

* Add usage sample in comment for check-version command

* Update all extensions to version 4.x

* Remove empty marketing versions

* Update podspec version to 4.0.0

* Update Podfile to use Core staging and Edge* dev branches

* Update SwiftLint version 0.52.0

* Fix format after SwiftLint update

* Update Podfile to use Core/Services production version

* Update podfile for Tutorial apps

Merge to Staging for 4.0.0 release