Normalize printed text

Signed-off-by: Richie Bendall <richiebendall@gmail.com>

v/vhdl.vhdl

@@ -7,7 +7,7 @@ architecture behaviour of hello_world is
 begin
 	process
     begin
-       write (output, String'("Hello world!"));
+       write (output, String'("Hello World"));
        wait;
     end process;
 end behaviour;