Update the description of Java Test Runner (#85)

Author: jdneo

README.md

@@ -14,7 +14,7 @@ By installing Java Extension Pack, the following extensions are installed:
 - [📦 Debugger for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-debug)
     - Debugging
 - [📦 Java Test Runner](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-test)
-    - Run & Debug JUnit Test Cases
+    - Run & Debug JUnit/TestNG Test Cases
 - [📦 Maven Project Explorer](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-maven)
     - Project Scaffolding
     - Custom Goals