Updated example to use latest version

Author: oliemansm

example/pom.xml

@@ -22,7 +22,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.8</java.version>
-        <graphql-spring-boot-starter.version>5.0.6</graphql-spring-boot-starter.version>
+        <graphql-spring-boot-starter.version>5.2</graphql-spring-boot-starter.version>
+        <graphql-java-tools.version>5.4.1-SNAPSHOT</graphql-java-tools.version>
     </properties>
 
     <dependencies>
@@ -63,8 +64,13 @@
         <dependency>
             <groupId>com.graphql-java-kickstart</groupId>
             <artifactId>graphql-java-tools</artifactId>
-            <version>5.3.5</version>
+            <version>${graphql-java-tools.version}</version>
         </dependency>
+        <!--<dependency>
+            <groupId>org.jetbrains.kotlin</groupId>
+            <artifactId>kotlin-stdlib</artifactId>
+            <version>1.3.10</version>
+        </dependency>-->
     </dependencies>
 
     <build>
@@ -73,6 +79,20 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>1.3.10</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>process-sources</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

pom.xml

@@ -14,7 +14,8 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.8</java.version>
-        <kotlin.version>1.3.0</kotlin.version>
+        <kotlin.version>1.3.10</kotlin.version>
+        <kotlin-coroutines.version>1.0.1</kotlin-coroutines.version>
         <jackson.version>2.9.6</jackson.version>
 
         <maven.compiler.source>${java.version}</maven.compiler.source>
@@ -37,12 +38,12 @@
         <dependency>
             <groupId>org.jetbrains.kotlinx</groupId>
             <artifactId>kotlinx-coroutines-jdk8</artifactId>
-            <version>1.0.0</version>
+            <version>${kotlin-coroutines.version}</version>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlinx</groupId>
             <artifactId>kotlinx-coroutines-reactive</artifactId>
-            <version>1.0.0</version>
+            <version>${kotlin-coroutines.version}</version>
         </dependency>
         <dependency>
             <groupId>com.graphql-java</groupId>