Rename 2013/endoh4/run.sh to try.sh + formatting

I believe that this completes the review of 2013.

2013/endoh4/README.md

@@ -65,11 +65,13 @@ This simple spec involves many details.
 
 (Note that this program does not use `math.h`.)
 
+
 ### Portability
 
 I think it conforms with both C89 and C99.  I confirmed that it worked on gcc,
 clang, and tcc.  It should not be warned with `-pedantic` and `-Wextra`.
 
+
 ### Tips
 
 You may want to use `tput` to hide the terminal cursor.