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.

1988/robison/README.md

@@ -1,7 +1,7 @@
 # Best abuse of C constructs
 
 Arch D. Robison<br>
-US  
+US
 
 ## To build:
 
@@ -28,7 +28,7 @@ The first and second parameters are optional.  You might also try:
 The following might make an interesting benchmark:
 
 ```sh
-./robison 100    
+./robison 100
 
 ```