Update README

Author: sbabcoc

README.md

@@ -205,6 +205,10 @@ The preceding **ServiceLoader** provider configuration files declare a **JUnit F
 * [ShutdownListener](https://github.com/Nordstrom/JUnit-Foundation/blob/master/src/main/java/com/nordstrom/automation/junit/ShutdownListener.java)  
 **ShutdownListener** provides callbacks for events in the lifecycle of the JVM that runs the Java code that comprises your tests. It receives the following notification:
   * The JVM that's running the tests is about to close. This signals the completion of the test run.
+* [RunnerWatcher](https://github.com/Nordstrom/JUnit-Foundation/blob/master/src/main/java/com/nordstrom/automation/junit/RunnerWatcher.java)  
+**RunnerWatcher** provides callbacks for events in the lifecycle of **`ParentRunner`** objects. It receives the following notifications:
+  * A **`ParentRunner`** object is about to run.
+  * A **`ParentRunner`** object has finished running.
 * [TestClassWatcher](https://github.com/Nordstrom/JUnit-Foundation/blob/master/src/main/java/com/nordstrom/automation/junit/TestClassWatcher.java)  
 **TestClassWatcher** provides callbacks for events in the lifecycle of **`TestClass`** objects. It receives the following notifications:
   * A **`TestClass`** object has been created to represent a JUnit test class or suite. Each **`TestClass`** has a one-to-one relationship with the JUnit runner that created it.