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.

2012/blakely/README.md

@@ -1,7 +1,7 @@
 # Most GIFted expressions
 
-Philip Blakely  
-UK  
+Philip Blakely\
+UK\
 <pmblakely@gmail.com>
 
 ## To build: