Update ReadMe.md

ReadMe.md

@@ -41,14 +41,11 @@ For local development, if you're not working on bytecode generation or the stand
 
 You also can use [Gradle properties](https://docs.gradle.org/current/userguide/build_environment.html#sec:gradle_configuration_properties) to setup `JDK_*` variables.
 
-Note: The JDK 9 for MacOS is not available on Oracle's site. You can install it by
+Note: The JDK 6 for MacOS is not available on Oracle's site. You can install it by
 
 ```bash
-$ brew tap adoptopenjdk/openjdk
-$ brew cask install adoptopenjdk9
-
-$ /usr/libexec/java_home -v 9 # get path to JDK 9
-/Library/Java/JavaVirtualMachines/adoptopenjdk-9.jdk/Contents/Home
+$ brew tap caskroom/versions
+$ brew cask install java6
 ```
 
 On Windows you might need to add long paths setting to the repo: