Bug in make_leads function

Bug in the following file: https://github.com/Kaggle/learntools/blob/master/learntools/time_series/utils.py

The function doesn't correctly create the leads. For example, setting leads to 1, it just copies the existing columns under a new column named: {name}_lead_0. See the attached screenshot for an example.

def make_leads(ts, leads, name='y'):
return pd.concat(
{f'{name}_lead_{i}': ts.shift(-i)
for i in reversed(range(leads))},
axis=1)