readme++

Author: inbravo

README.md

@@ -8,9 +8,10 @@
 -  [Simulator for 'OutOfMemoryError'][OutOfMemoryErrorSim.md]
 -  [Singleton using 'enum'][EnumSingletonTest.md]
 -  [How Remote Method Invocation(RMI) works][PowerServiceImpl.md]
+##### JDK 9 language features 
 -  [How 'jshell' (Read-Eval-Print Loop : JEP-222) works][JShellTest.md]
 -  [How 'VarHandle' class (JEP-193) works][VarHandleTest.md]
--  [Oracle has removed underscore ('_') identifier in JDK 9][UnderscoreAsIdentifierTest.md]
+-  [Underscore ('_') identifier is removed][UnderscoreAsIdentifierTest.md]
 
 #### JVM features 
 -  [How JVM method-inline optimization works][NoClassInstance.md]