Wrong indention in the demo code on https://www.taichi-lang.org/

[YANG-H]

The demo code fractal.py shown in https://www.taichi-lang.org/ has indention error.

Current:

    ...
    iterations = 0
while z.norm() < 20 and iterations < 50:
    z = complex_sqr(z) + c
    ....

Correct:

    ...
    iterations = 0
    while z.norm() < 20 and iterations < 50:
        z = complex_sqr(z) + c
        ....

[ailzhang]

@YANG-H Thanks for reporting! We'll get it fixed asap.