Add recommended JDK versions

Author: Xylus

quickstart/README.md

@@ -6,13 +6,13 @@ Pinpoint QuickStart provides a sample TestApp for the Agent to attach itself to,
 ## Requirements
 In order to build Pinpoint, the following requirements must be met:
 
-* JDK 6 installed
-* JDK 7 installed
+* JDK 6 installed ([jdk1.6.0_45](http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html#jdk-6u45-oth-JPR) recommended)
+* JDK 7 installed ([jdk1.7.0_80](http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html#jdk-7u80-oth-JPR) recommended)
 * JDK 8 installed
 * Maven 3.2.x+ installed
 * JAVA_6_HOME environment variable set to JDK 6 home directory.
 * JAVA_7_HOME environment variable set to JDK 7 home directory.
-* JAVA_8_HOME environment variable set to JDK 8+ home directory.
+* JAVA_8_HOME environment variable set to JDK 8 home directory.
 
 QuickStart supports Linux, OSX, and Windows.