A improved supermario game based on https://github.com/justinmeister/Mario-Level-1.
- support four levels：level 1-1 to level 1-4
- support go into the pipe
- use json file to store level data (e.g. position of enemy, brick, box and pipe)
- add new enemies in level 1-3 and 1-4
- add slider in level 1-2
- Python 3.7
- Python-Pygame 1.9
$ python main.py
- use LEFT/RIGHT/DOWN key to control player
- use key 'a' to jump
- use key 's' to shoot firewall or run
