[LANG-1365] Fix NullPointerException in isJavaVersionAtLeast on Java 10, add SystemUtils.IS_JAVA_10, add JavaVersion.JAVA_10.

Fix check-style violations.

src/main/java/org/apache/commons/lang3/JavaVersion.java

@@ -103,6 +103,7 @@ public enum JavaVersion {
      * The float value.
      */
     private final float value;
+
     /**
      * The standard name.
      */