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.

1992/gson/README.md

@@ -4,7 +4,7 @@ Andreas Gustafsson
 Helsinki University of Technology  
 Arentikuja 1 D 305		 
 00410 Helsinki  
-Finland  
+Finland
 
 
 ## To build:
@@ -31,7 +31,7 @@ it located in one of the following places:
 /usr/share/lib/spell/words
 /usr/ucblib/dict/words
 /dev/null			# <-- for machines with nothing to say
-```  
+```
 
 Then using the proper dictionary:
 
@@ -88,7 +88,7 @@ obfuscated shell script:
 ```sh
 #!/bin/sh
 z=a-z];tr [A-Z\] \[$z|sed s/[\^$z[\^$z*/_/g|tr _ \\012|grep ..|sort -u
-``` 
+```
 
 Using articles from alt.folklore.computers is likely to make
 a more professional-looking dictionary than rec.arts.erotica.