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.

1987/biggar/README.md

@@ -34,7 +34,7 @@ so what if the Makefiles grow a little!  :-)
 
 One vendor's lint got hung in an infinite loop over this entry!
 
-FYI:  We will let Mark get away with this truly sick entry this time, but 
+FYI:  We will let Mark get away with this truly sick entry this time, but\
 for the future on we have placed a limit on the size of a compile line.
 
 NOTE: originally we made a comment in [Larry Wall's

1987/korn/README.md

@@ -1,6 +1,6 @@
 # Best One Liner
 
-David Korn   
+David Korn\
 US
 
 ## To build:

1987/lievaart/README.md

@@ -1,6 +1,6 @@
 # Grand Prize
 
-Roemer B. Lievaart  
+Roemer B. Lievaart\
 Netherlands
 
 ## To build: