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.

1996/schweikh3/README.md

@@ -5,7 +5,7 @@ DFN Network Operation Center
 Schlartaeckerweg 3 (home address)  
 D-71384 Weinstadt  
 Germany  
-<http://www.schweikhardt.net>  
+<http://www.schweikhardt.net>
 
 ## To build:
 
@@ -18,7 +18,7 @@ make all
 **WARNING: DO NOT RUN this program without reading this text down to the end!**
 It may render your system unusable for a limited amount of time
 or force you to reboot using the Big Red Button!  This is **NOT** a joke.
-You have been warned.  
+You have been warned.
 
 ```sh
 ./schweikh3