sculptor#255 - adds hint regarding supported Java version

Author: tjuerge

README.md

@@ -28,7 +28,7 @@ Sculptor takes care of the technical details, the tedious repetitive work, and l
 
 To use Sculptor you need local installations of the following tools:
 
-* [Java JDK](http://www.oracle.com/technetwork/java/javase/downloads/) (1.8 or newer)
+* [Java JDK](http://www.oracle.com/technetwork/java/javase/downloads/) (1.8)
 * [Maven](http://maven.apache.org/download.html) (3.5.0 or newer)
 * [Eclipse](http://eclipse.org/downloads/) (4.7 or newer) with [Xtext](http://www.eclipse.org/Xtext/download.html) (2.15.0 or newer)
 * (optional) [GraphViz](http://www.graphviz.org/) (2.2.8 or newer)