adjusted readme

Author: overheadhunter

README.md

@@ -41,7 +41,7 @@ public void encryptWithAssociatedData() {
   <dependency>
     <groupId>org.cryptomator</groupId>
     <artifactId>siv-mode</artifactId>
-    <version>1.2.0</version>
+    <version>1.2.1</version>
   </dependency>
 </dependencies>
 ```