Changed shell block style

README.md

@@ -4,16 +4,16 @@ Solutions to [Advent of Code 2019](https://adventofcode.com/2019) in Python 3.
 ## Usage
 To solve all puzzles with implemented solutions run 
 ```console
-foo@bar:~$ python3 main.py 
+$ python3 main.py 
 ```
 or alternatively make the main program executable
 ```console
-foo@bar:~$ chmod +x main.py
-foo@bar:~$ ./main.py
+$ chmod +x main.py
+$ ./main.py
 ```
 For other options see `./main.py -h`
 ```console
-foo@bar:~$ ./main.py -h
+$ ./main.py -h
 usage: main.py [-h] [-d DAY[-DAY]] [-i INPUT] [-t]
 
 Solves Advent of Code 2019 puzzles. The puzzles are available at