Use c-style syntax for newline

See: https://www.nasm.us/xdoc/2.14.02/html/nasmdoc3.html#section-3.4.2

README.md

@@ -47,7 +47,7 @@ schleife:
         cmp     ebx,dword [ebp-4]
         je      ende
 
-        mov     byte [msg+msg_len-4],bl
+        mov     byte [msg+msg_len-3],bl
 
         push    dword msg
         call    printf
@@ -69,9 +69,7 @@ ende:
         int     0x80
 
 SECTION .data
-CR      equ     13
-LF      equ     10
-msg     db      "Hello World! ebx = ?",CR,LF,0
+msg     db      `Hello World! ebx = ?\n`,0
 msg_len equ     $-msg
 ```