chore: fix "released" is a nullable field (#31)

* chore: fix nullable "released" field

* version change

Author: official-wizard

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.retroachievements</groupId>
     <artifactId>api-kotlin</artifactId>
-    <version>1.0.10</version>
+    <version>1.0.11</version>
 
     <dependencyManagement>
         <dependencies>