message: Mention the Java 8 dependency in README.md teplate for new Polymer 3 applications
diff: @@ -30,4 +30,4 @@ $ polymer serve build/default
  $ polymer test
  ```
  -Your application is already set up to be tested via [web-component-tester](https://github.com/Polymer/web-component-tester). Run `polymer test` to run your application's test suite locally.
  +Your application is already set up to be tested via [web-component-tester](https://github.com/Polymer/web-component-tester). Run `polymer test` to run your application's test suite locally. [Java SE Development Kit 8](http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) is required. Note that if you do not have the `javac` command installed, you will be promted to install Java 10. To uninstall Java, see the direction [here](https://www.java.com/en/download/help/mac_uninstall_java.xml).
  