Upgrade maven-surefire-plugin to 2.22.0 to support Java 10
diff --git a/pom.xml b/pom.xml
index fa883d4..cca422b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -132,6 +132,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.0</version>
           <configuration>
             <environmentVariables>
               <JENKINS_MAVEN_AGENT_DISABLED>true</JENKINS_MAVEN_AGENT_DISABLED>