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/rince/README.md

@@ -1,10 +1,10 @@
 # Astronomically Obfuscated
 
-James Bonfield  
-MRC Laboratory of Molcular Biology  
-Hills Road   
-Cambridge  
-CB2 2QH  
+James Bonfield\
+MRC Laboratory of Molcular Biology\
+Hills Road\
+Cambridge\
+CB2 2QH\
 England
 
 ## To build: