Updating version to 1.2.0

Updated version to 1.1.5, and LayerKit dependency to 0.26.13 (#1450)

Updated version to 1.1.4. Updated LayerKit dependency to 0.26.12

Fix Carthage support (#1409)

* Restore Atlas.framework

* Fix documentation issues

* Restore unintentionally deleted documentation

* Remove hard-coded framework search path

* Make headers public

* Import category headers

* Fixed crash in ATLMediaInputStream (#1420)

* Fixed crash in ATLMediaInputStream when sending image from camera roll on iOS 11

* Updated CHANGELOG.md

* Fixed conversation input field for iOS 11 (#1418)

* Fixed conversation input field for iOS 11

* Fixed crash in ATLMediaInputStream (#1420)

* Fixed crash in ATLMediaInputStream when sending image from camera roll on iOS 11

* Updated CHANGELOG.md

* Fixed conversation input field for iOS 11

* Updated CHANGELOG.md

* Updated version to 1.1.2. Updated LayerKit dependency to 0.26.9

* Restore Atlas.framework

* Fix documentation issues

* Restore unintentionally deleted documentation

* Remove hard-coded framework search path

* Make headers public

* Import category headers

* Updated CHANGELOG.md

Updated version to 1.1.2. Updated LayerKit dependency to 0.26.9

Updated version to 1.1.1. Updated LayerKit dependency to 0.26.5

Merge pull request #1374 from layerhq/feature/APPS-2740_Presence

APPS-2740 - Presence Feature

Updated version to 1.0.33

Updated podspec URLs

Update CHANGELOG.md