update changelog & version

+## 5.2.2
+
+Improvements:
+* [MacOS] Adds Swift Package Manager support.
+* [MacOS] Adds support for `returnImage`.
+* Added a new `size` property to `Barcode`, that denotes the bounding box of the barcode.
+
+Bugs fixed:
+* Fixed some documentation errors for the `size` and `image` of `BarcodeCapture`.
+* [iOS] Fixed a bug with `returnImage`.
+* [Android/iOS] Adjusted the raw barcode scan value to pass the raw event data, like on MacOS.
+
 ## 5.2.1
 
 * Updates the `package:web` dependency to use a version range.
@@ -44,7 +56,7 @@ Improvements:
 This major release contains all the changes from the 5.0.0 beta releases, along with the following changes:
 
 Improvements:
-- [Android] Remove the Kotlin Standard Library from the dependencies, as it is automatically included in Kotlin 1.4+
+* [Android] Remove the Kotlin Standard Library from the dependencies, as it is automatically included in Kotlin 1.4+
 
 ## 5.0.0-beta.3
 **BREAKING CHANGES:**

@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'mobile_scanner'
-  s.version          = '5.2.1'
+  s.version          = '5.2.2'
   s.summary          = 'An universal scanner for Flutter based on MLKit.'
   s.description      = <<-DESC
 An universal scanner for Flutter based on MLKit.

@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'mobile_scanner'
-  s.version          = '5.2.1'
+  s.version          = '5.2.2'
   s.summary          = 'An universal scanner for Flutter based on MLKit.'
   s.description      = <<-DESC
 An universal scanner for Flutter based on MLKit.

 name: mobile_scanner
 description: A universal barcode and QR code scanner for Flutter based on MLKit. Uses CameraX on Android, AVFoundation on iOS and Apple Vision & AVFoundation on macOS.
-version: 5.2.1
+version: 5.2.2
 repository: https://github.com/juliansteenbakker/mobile_scanner
 
 screenshots: