Flush output automatically

Otherwise output is not visible on the console.
diff --git a/org.jacoco.cli/src/org/jacoco/cli/internal/Main.java b/org.jacoco.cli/src/org/jacoco/cli/internal/Main.java
index 63a464d..50c9621 100644
--- a/org.jacoco.cli/src/org/jacoco/cli/internal/Main.java
+++ b/org.jacoco.cli/src/org/jacoco/cli/internal/Main.java
@@ -75,8 +75,8 @@
 	 *             on the console
 	 */
 	public static void main(final String... args) throws Exception {
-		new Main(args).execute(new PrintWriter(System.out),
-				new PrintWriter(System.err));
+		new Main(args).execute(new PrintWriter(System.out, true),
+				new PrintWriter(System.err, true));
 	}
 
 }