Improve formatting

tst/README.md

@@ -9,8 +9,12 @@ and its dependencies:
 * php5-xdebug
 
 Example for Debian and Ubuntu:
-    $ sudo aptitude install phpunit php5-gd php5-sqlite php5-xdebug
+```sh
+$ sudo aptitude install phpunit php5-gd php5-sqlite php5-xdebug
+```
 
 To run the tests, just change into this directory and run phpunit:
-    $ cd PrivateBin/tst
-    $ phpunit
+```sh
+$ cd PrivateBin/tst
+$ phpunit
+```