Version bump in readme

README.md

@@ -66,15 +66,15 @@ To add the newest Craco version as a dependency, add this to your project's POM:
 <dependency>
     <groupId>org.cryptimeleon</groupId>
     <artifactId>craco</artifactId>
-    <version>[3.0,)</version>
+    <version>[4.0,)</version>
 </dependency>
 ```
 
 ### Installation With Gradle
 
 Craco is published via Maven Central.
 Therefore, you need to add `mavenCentral()` to the `repositories` section of your project's `build.gradle` file.
-Then, add `implementation group: 'org.cryptimeleon', name: 'craco', version: '3.+'` to the `dependencies` section of your `build.gradle` file.
+Then, add `implementation group: 'org.cryptimeleon', name: 'craco', version: '4.+'` to the `dependencies` section of your `build.gradle` file.
 
 For example:
 
@@ -84,7 +84,7 @@ repositories {
 }
 
 dependencies {
-    implementation group: 'org.cryptimeleon', name: 'craco', version: '3.+'
+    implementation group: 'org.cryptimeleon', name: 'craco', version: '4.+'
 }
 ```