Typo

[raunilillemets]

Hello and thanks for Your interesting book! I am trying to use the Python3 version of the code and I found the following typo:

Shouldn't line 516 in "thinkplot.py" be:
xs = np.delete(xs, 0)
instead of:
xs = xp.delete(xs, 0)
?

If I am mistaken, how should the correct variant be?

[raunilillemets]

I created a pull request in the hope that I made the correction (wait for it) correctly.

I know its a rather minor thing for creating a pull request, but I am just trying to get accustomed with GitHub; if there are any best practices, etc., that I should now, then shoot.