put something meaningful instead of C65 DOS version string

src/dos_m65/4020.dos_vectable.s

@@ -0,0 +1,14 @@
+
+; A vector table to integrate DOS with the MEGA65 Kernal
+
+!word dos_INIT
+!word dos_CHKUNIT
+!word dos_SETUNIT
+!word dos_ACPTR
+!word dos_CIOUT
+!word dos_LISTEN
+!word dos_SECOND
+!word dos_TALK
+!word dos_TKSA
+!word dos_UNTLK
+!word dos_UNLSN