Pyxel install doesn't work on macbook
Can someone help me resolve this issue? 

I followed the install instructions for mac but am unable to locate module pyxel. 

If I write `pyxel` the editor opens in a new window "Hello, Pyxel Editor!" 

```
this:pyxel_examples dev$ python3 01_hello_pyxel.py 
Traceback (most recent call last):
  File "01_hello_pyxel.py", line 1, in <module>
    import pyxel
ModuleNotFoundError: No module named 'pyxel'
```

