docs(readme): moved migration information into expandable sections

Author: Christian Elies

README.md

@@ -148,8 +148,10 @@ AdvancedList(yourData, content: { item in
 
 For more examples take a look at [AdvancedList-SwiftUI](https://github.com/crelies/AdvancedList-SwiftUI).
 
-## Migration 2.x -> 3.0
+## Migration
 
+<details>
+<summary>Migration 2.x -> 3.0</summary>
 The `AdvancedList` was dramatically simplified and is now more like the `List` and `ForEach` SwiftUI views.
 
 1. Delete your list service instances and directly **pass your data to the list initializer**
@@ -158,6 +160,7 @@ The `AdvancedList` was dramatically simplified and is now more like the `List` a
 4. **Move and delete:** Instead of setting `AdvancedListActions` on your list service just pass a `onMoveAction` and/or `onDeleteAction` block to the initializer
 
 **Before:**
+
 ```swift
 import AdvancedList
 
@@ -193,6 +196,7 @@ listService.listState = .items
 ```
 
 **After:**
+
 ```swift
 import AdvancedList
 
@@ -221,12 +225,14 @@ AdvancedList(yourData, content: { item in
     Text("Loading ...")
 }, pagination: .noPagination)
 ```
+</details>
 
-## Migration 3.0 -> 4.0
-
+<details>
+<summary>Migration 3.0 -> 4.0</summary>
 Thanks to a hint from @SpectralDragon I could refactor the `onMove` and `onDelete` functionality to view modifiers.
 
 **Before:**
+
 ```swift
 import AdvancedList
 
@@ -257,6 +263,7 @@ AdvancedList(yourData, content: { item in
 ```
 
 **After:**
+
 ```swift
 import AdvancedList
 
@@ -287,3 +294,4 @@ AdvancedList(yourData, content: { item in
     // delete me
 }
 ```
+</details>