Merge pull request #3500 from pycaret/update_schemdraw

update to new schemdraw

requirements.txt

@@ -30,7 +30,7 @@ scikit-plot>=0.3.7
 yellowbrick>=1.4
 plotly>=5.0.0
 kaleido>=0.2.1
-schemdraw>=0.14, <0.16
+schemdraw==0.15  # 0.16 only supports Python >3.8
 plotly-resampler>=0.8.3.1
 
 # Time-series