Upgraded Maven Surefire plugin to version 2.21.0
diff --git a/pom.xml b/pom.xml
index 16aa7e8..0489884 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,7 +55,7 @@
 ====================================
 
 HC style check definition 1 -> 2
-maven-surefire-plugin 2.20 -> 2.20.1 (required to build with Java 9 GA.)
+maven-surefire-plugin 2.20 -> 2.21.0 (required to build with Java 9 and Java 10)
 
 Version 9 - changes since version 8
 ===================================
@@ -980,7 +980,7 @@
     <hc.javadoc.version>3.0.0</hc.javadoc.version>
     <hc.jxr.version>2.5</hc.jxr.version>
     <hc.surefire-report.version>2.20.1</hc.surefire-report.version>
-    <hc.surefire.version>2.20.1</hc.surefire.version>
+    <hc.surefire.version>2.21.0</hc.surefire.version>
     <hc.project-info.version>2.9</hc.project-info.version>
     <hc.checkstyle.version>2.17</hc.checkstyle.version>
     <hc.rat.version>0.12</hc.rat.version>