'README.md' updaten

README.md

@@ -8,21 +8,21 @@ a shell script to aid the adding of EXIF comments in photographs or images of mo
 
 ### Install exiftool
 
-$ sudo apt install exiftool
+    $ sudo apt install exiftool
 
 ### Install chafa 
 
 <https://hpjansson.org/chafa/>
 <https://github.com/hpjansson/chafa/>
 
-$ sudo apt install chafa
+    $ sudo apt install chafa
 
 Works for Debian Buster, but not on Stretch, ...
 Doesn't work on Ubuntu 16, ...
 
 ### Install feh 
 
-$ sudo apt install feh
+    $ sudo apt install feh
 
 ## Authors :
 * MB