Update README.md

Author: sbabcoc

README.md

@@ -151,7 +151,7 @@ Note that some associations are not available for specific context:
 * `LifecycleHooks.getThreadRunner()`  
 Get the runner that owns the active thread context.
 * `LifecycleHooks.describeChild(Object target, Object child)`  
-Get a `Description` for the indicated child object from the runner for the specified test class instance.
+Get a **Description** for the indicated child object from the runner for the specified test class instance.
 * `LifecycleHooks.getInstanceClass(Object instance)`  
 Get class of specified test class instance.
 * `LifecycleHooks.getFieldValue(Object target, String name)`