Rename 2013/runme to cable3.sh

This is to be consistent with other entries that have wrapper scripts
for the entry which are named winner.sh.

2013/cable3/cable3.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+make clobber all || exit 1
+clear
+stty cbreak raw -echo min 0
+if [[ -f hd.img ]]
+then
+    ./cable3 bios fd.img hd.img
+else
+    ./cable3 bios fd.img
+fi
+stty cooked echo