Update to latest kotlin and fix incorrect jackson version in the example (#233)

Author: dariuszkuc

example/pom.xml

@@ -61,7 +61,8 @@
     <properties>
         <!-- Project versions -->
         <java.version>1.8</java.version>
-        <kotlin.version>1.3.21</kotlin.version>
+        <kotlin.version>1.3.31</kotlin.version>
+        <spring-boot.version>2.1.2.RELEASE</spring-boot.version>
 
         <!-- Dependency Versions -->
         <graphql-kotlin.version>0.4.1-SNAPSHOT</graphql-kotlin.version>
@@ -79,26 +80,20 @@
             <version>${graphql-kotlin.version}</version>
         </dependency>
         <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-webflux</artifactId>
-            <version>2.1.2.RELEASE</version>
+            <groupId>com.fasterxml.jackson.module</groupId>
+            <artifactId>jackson-module-kotlin</artifactId>
         </dependency>
         <dependency>
-            <groupId>io.projectreactor.netty</groupId>
-            <artifactId>reactor-netty</artifactId>
-            <version>0.8.4.RELEASE</version>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webflux</artifactId>
+            <version>${spring-boot.version}</version>
         </dependency>
         <dependency>
             <groupId>org.jetbrains.kotlin</groupId>
             <artifactId>kotlin-test</artifactId>
             <version>${kotlin.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>com.fasterxml.jackson.module</groupId>
-            <artifactId>jackson-module-kotlin</artifactId>
-            <version>2.8.8</version>
-        </dependency>
     </dependencies>
 
     <build>

pom.xml

@@ -76,8 +76,8 @@
         <!-- Dependency Versions -->
         <graphql-java.version>11.0</graphql-java.version>
         <jackson-module-kotlin.version>2.9.8</jackson-module-kotlin.version>
-        <kotlin.version>1.3.21</kotlin.version>
-        <kotlin-coroutines.version>1.1.1</kotlin-coroutines.version>
+        <kotlin.version>1.3.31</kotlin.version>
+        <kotlin-coroutines.version>1.2.1</kotlin-coroutines.version>
         <reflections.version>0.9.11</reflections.version>
 
         <!-- Test Dependency Versions -->