[spring-server] update to use SpringBoot 2.2.0.RELEASE (#435)

Author: dariuszkuc

graphql-kotlin-spring-server/pom.xml

@@ -118,20 +118,4 @@
             </plugin>
         </plugins>
     </build>
-
-    <!-- TODO remove after Spring Boot 2.2 is released -->
-    <repositories>
-        <repository>
-            <id>spring-milestones</id>
-            <name>Spring Milestones</name>
-            <url>https://repo.spring.io/milestone</url>
-        </repository>
-    </repositories>
-    <pluginRepositories>
-        <pluginRepository>
-            <id>spring-milestones</id>
-            <name>Spring Milestones</name>
-            <url>https://repo.spring.io/milestone</url>
-        </pluginRepository>
-    </pluginRepositories>
 </project>

pom.xml

@@ -67,7 +67,7 @@
         <kotlin.version>1.3.50</kotlin.version>
         <kotlin-coroutines.version>1.3.2</kotlin-coroutines.version>
         <reflections.version>0.9.11</reflections.version>
-        <spring-boot.version>2.2.0.RC1</spring-boot.version>
+        <spring-boot.version>2.2.0.RELEASE</spring-boot.version>
 
         <!-- Test Dependency Versions -->
         <junit-jupiter.version>5.5.2</junit-jupiter.version>