fix version typo in getting started maven snippet (#21)

Author: danielemegna

content/documentation/v13/getting-started.md

@@ -42,7 +42,7 @@ Dependency:
     <dependency>
         <groupId>com.graphql-java</groupId>
         <artifactId>graphql-java</artifactId>
-        <version>113.0</version>
+        <version>13.0</version>
     </dependency>
 {{< / highlight >}}