diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..9c09fb8
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,2 @@
+github: clue
+custom: https://clue.engineering/support
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b232812..0c22453 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 2.4.0 (2020-11-20)
+
+*   Fix: Refactor executing functional tests without ext-readline.
+    (#95 by @clue)
+
+*   Improve test suite and add `.gitattributes` to exclude dev files from export.
+    Prepare PHP 8 support, update to PHPUnit 9 and simplify test matrix.
+    (#93 and #94 by @SimonFrings)
+
 ## 2.3.0 (2019-08-28)
 
 *   Feature: Emit audible/visible BELL signal when using a disabled function.
diff --git a/README.md b/README.md
index a5c643b..8647344 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ without requiring any extensions or special installation.
 
 **Table of contents**
 
+* [Support us](#support-us)
 * [Quickstart example](#quickstart-example)
 * [Usage](#usage)
   * [Stdio](#stdio)
@@ -32,6 +33,16 @@ without requiring any extensions or special installation.
 * [License](#license)
 * [More](#more)
 
+## Support us
+
+We invest a lot of time developing, maintaining and updating our awesome
+open-source projects. You can help us sustain this high-quality of our work by
+[becoming a sponsor on GitHub](https://github.com/sponsors/clue). Sponsors get
+numerous benefits in return, see our [sponsoring page](https://github.com/sponsors/clue)
+for details.
+
+Let's take these projects to the next level together! 🚀
+
 ## Quickstart example
 
 Once [installed](#install), you can use the following code to present a prompt in a CLI program:
@@ -622,7 +633,7 @@ This project follows [SemVer](https://semver.org/).
 This will install the latest supported version:
 
 ```bash
-$ composer require clue/stdio-react:^2.3
+$ composer require clue/stdio-react:^2.4
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
diff --git a/composer.json b/composer.json
index 2e67a34..09eb64b 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
     "authors": [
         {
             "name": "Christian Lück",
-            "email": "christian@lueck.tv"
+            "email": "christian@clue.engineering"
         }
     ],
     "require": {