Update dokka.

Author: trekawek

pom.xml

@@ -248,7 +248,7 @@
                     <plugin>
                         <groupId>org.jetbrains.dokka</groupId>
                         <artifactId>dokka-maven-plugin</artifactId>
-                        <version>2.0.0</version>
+                        <version>2.2.0</version>
                         <executions>
                             <execution>
                                 <phase>prepare-package</phase>