feat: remove warning (#104)

Remove a warning that a categorical column with many categories is used
for coloring of TS line plot.
Following #94, which removes most of the warnings, the warning here is
removed since it does not bring relevant information to the user (the
user can see that there are many colors), and makes the final reports
ugly.

edvart/report_sections/timeseries_analysis/time_series_line_plot.py

@@ -1,6 +1,5 @@
 """Time series line plot package."""
 
-import warnings
 from typing import Any, Dict, List, Optional
 
 import nbformat.v4 as nbfv4
@@ -116,8 +115,6 @@ def _time_series_line_plot_colored(df, columns=None, color_col=None):
         layout = dict(xaxis_rangeslider_visible=True)
         if not is_categorical(df[color_col]):
             raise ValueError(f"Cannot color by non-categorical column `{color_col}`")
-        if df[color_col].nunique() > 20:
-            warnings.warn("Coloring by categorical column with many unique values!")
         df_color_shifted = df[color_col].shift(-1)
         for col in columns:
             data = [