Merge pull request #346 from dynatrace-oss/release-0.21.0

prepare for release

Author: oertl

README.md

@@ -26,12 +26,12 @@ To add a dependency on hash4j using Maven, use the following:
 <dependency>
   <groupId>com.dynatrace.hash4j</groupId>
   <artifactId>hash4j</artifactId>
-  <version>0.20.0</version>
+  <version>0.21.0</version>
 </dependency>
 ```
 To add a dependency using Gradle:
 ```gradle
-implementation 'com.dynatrace.hash4j:hash4j:0.20.0'
+implementation 'com.dynatrace.hash4j:hash4j:0.21.0'
 ```
 
 ## Hash algorithms

build.gradle

@@ -144,7 +144,7 @@ tasks.withType(JavaCompile).configureEach {
 }
 
 group = "com.dynatrace.hash4j"
-version = "0.20.0"
+version = "0.21.0"
 
 
 static def readJavaLicense(licenseName) {