Update java version requirements in ant build

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1553856 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/default.properties b/default.properties
index d8d2e27..93d6d46 100644
--- a/default.properties
+++ b/default.properties
@@ -70,12 +70,12 @@
 # In particular, if you use JDK 1.4+ the generated classes will not be usable
 # for a 1.1 Java VM unless you explicitly set this attribute to the value 1.1 
 # (which is the default value for JDK 1.1 to 1.3).
-compile.target = 1.5
+compile.target = 1.6
 
 # Specifies the source version for the Java compiler.
 # Corresponds to the source attribute for the ant javac task. 
 # Valid values are 1.3, 1.4, 1.5. 
-compile.source = 1.5
+compile.source = 1.6
 
 # Specifies the source encoding.
 compile.encoding = ISO-8859-1