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.

1993/vanb/README.md

@@ -4,7 +4,7 @@ David Van Brackle
 ISX Corporation  
 1165 Northchase Parkway, Suite 120  
 Marietta, GA 30067  
-US  
+US
 
 
 ## To build:
@@ -46,7 +46,7 @@ hex numbers:		x or X follow by hex digits
 decimal numbers:	d or D follow by decimal digits
 octal numbers:		octal digits
 grouping:		()
-```  
+```
 
 No spaces are allowed in the expression.  To avoid shell expansion,
 one should surround the expression in single quotes.