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.

2000/dlowe/README.md

@@ -1,7 +1,7 @@
 # Worst Abuse of the Rules
 
-David Lowe  
-US  
+David Lowe\
+US\
 <https://github.com/dlowe>