Fix README.

Change-Id: If23b90c617ed3ecaf76c81ca9830e6012c65b93f
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1547
Reviewed-by: Till Westmann <tillw@apache.org>
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/README.md b/README.md
index 7f28757..792e355 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@
 * A Unix-ish environment (Linux, OS X, will all do).
 * git
 * Maven 3.3.9 or newer.
-* Java 8 or newer.
+* Oracle JDK 8 or newer.
 
 Instructions for building the master:
 
@@ -86,8 +86,8 @@
 
 ## Documentation
 
-[master](https://ci.apache.org/projects/asterixdb/index.html) |
-[0.9.0](https://ci.apache.org/projects/asterixdb/index.html)
+* [master](https://ci.apache.org/projects/asterixdb/index.html) |
+  [0.9.0](http://asterixdb.apache.org/docs/0.9.0/index.html)
 
 ## Community support