High complexity for chained Pandas Query

[corriebar]

Describe the bug
I ran it on the following code of chained pandas methods:

    mean_distances = (dataframe
                         .groupby('group')['distance']
                         .mean()
                         .to_frame()
                         .reset_index()
                         .fillna(0)
                         .rename(columns={'distance': 'distance_mean'})
                         )

and was surprised to get a complexity of 11. While I wouldn't argue that this expression should have 0 complexity, 11 seems to high for me. I also wondered if panda query chaining also could be case similarly to Django ORM queries to get lower complexity.

Expected behavior
A lower complexity.

**Version

• 0.0.11

Additional context
This might be related to #22