Update Java Version

Author: denis-yuen

README.md

@@ -44,7 +44,7 @@ approach on MacOS (or even another version of Linux).
 
 ###Java
 
-SeqWare requires Oracle JDK 1.7 or greater, we primarily write and test with JDK 1.7.x.
+SeqWare requires Oracle JDK 1.8 or greater, we primarily write and test with JDK 1.8.x.
 An example of instructions on how to update your Linux installation can be found [here](https://ccp.cloudera.com/display/CDH4DOC/Before+You+Install+CDH4+on+a+Single+Node#BeforeYouInstallCDH4onaSingleNode-InstalltheOracleJavaDevelopmentKit). You will need to use the method appropriate to your distribution to install this.
 
 ## Building