replace trailing whitespace with blackslash in README.md

As an alternative to the markdown trailing whitespace as a line
break, we use a trailing blackslash as a markdown line break.

2001/ctk/README.md

@@ -1,8 +1,8 @@
 # Worst Driver
 
-Chris King  
-115 Foster Center Road  
-Foster, RI, 02825  
+Chris King\
+115 Foster Center Road\
+Foster, RI, 02825\
 US