Prepare release 2.4.0.

Author: UweTrottmann

README.md

@@ -20,7 +20,7 @@ This library is available on Maven Central.
 <a href="https://search.maven.org/search?q=com.uwetrottmann.androidutils"><img src="https://img.shields.io/maven-central/v/com.uwetrottmann.androidutils/androidutils.svg?style=flat-square"></a>
 
 ```groovy
-implementation("com.uwetrottmann.androidutils:androidutils:2.3.1")
+implementation("com.uwetrottmann.androidutils:androidutils:2.4.0")
 ```
 
 ## License

RELEASE_NOTES.md

@@ -1,6 +1,14 @@
 Release Notes
 =============
 
+## 2.4.0
+_2020-09-17_
+
+- Migrate to AndroidX.
+- Change `CheatSheet` to internally use `TooltipCompat` from AndroidX appcompat.
+- Add Android API level checks up to Android 11 (API level 30).
+- Add nullability, permission and type annotations.
+
 ## 2.3.1
 _2017-08-03_
 

androidutils/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'maven-publish'
 apply plugin: 'signing'
 
 group = "com.uwetrottmann.androidutils"
-version = "2.3.2-SNAPSHOT"
+version = "2.4.0"
 
 android {
     compileSdkVersion 30 // Android 11