[CC-797] Set release version. (#156)

Author: Ryouzanpaku

CHANGELOG.md

@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres
 to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## UNRELEASED
+## [5.2.0](https://github.com/unzerdev/java-sdk/compare/5.1.0..5.2.0)
 
 Twint payment method is added to Java SDK.
 

README.md

@@ -14,7 +14,7 @@ Java 1.8 or later.
 <dependency>
   <groupId>com.unzer.payment</groupId>
   <artifactId>java-sdk</artifactId>
-  <version>5.1.0</version>
+    <version>5.2.0</version>
 </dependency>
 ```
 

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.unzer.payment</groupId>
     <artifactId>java-sdk</artifactId>
-    <version>5.1.0</version>
+    <version>5.2.0</version>
     <name>Unzer Java SDK</name>
     <description>Unzer SDK provides an easy way to use Unzer Payment API.</description>
     <url>https://docs.unzer.com/</url>