Merge pull request #693 from c0s/readme

Updating README to reflect Scala 2.9.3 requirements

README.md

@@ -12,7 +12,7 @@ This README file only contains basic setup instructions.
 
 ## Building
 
-Spark requires Scala 2.9.2 (Scala 2.10 is not yet supported). The project is
+Spark requires Scala 2.9.3 (Scala 2.10 is not yet supported). The project is
 built using Simple Build Tool (SBT), which is packaged with it. To build
 Spark and its example programs, run: