fix improper use of whitespace in README.md files

The use of the markdown trailing whitespace to indicate
line break should NOT be done when the following line is empty.

This removes such improper use of whitespace in README.md files.

1987/biggar/README.md

@@ -30,7 +30,7 @@ increases the size of Makefiles.
 
 With only slight variations, this program can be set to many uses.
 Consider how easy it would be to release `Unix` source in this form;
-so what if the Makefiles grow a little!  :-) 
+so what if the Makefiles grow a little!  :-)
 
 One vendor's lint got hung in an infinite loop over this entry!