[ban265] sort sources

README.md

@@ -33,8 +33,9 @@ This is an alternative data analytics tool
     ```
 
 ## Cited Source
-1. https://jupyter-docker-stacks.readthedocs.io/en/latest/index.html
-2. https://pandas.pydata.org/docs/
-3. https://numpy.org/doc/stable/
-4. https://matplotlib.org/stable/index.html
-5. https://scikit-learn.org/stable/user_guide.html
\ No newline at end of file
+1. https://black.readthedocs.io/en/stable/
+2. https://jupyter-docker-stacks.readthedocs.io/en/latest/index.html
+3. https://matplotlib.org/stable/index.html
+4. https://numpy.org/doc/stable/
+5. https://pandas.pydata.org/docs/
+6. https://scikit-learn.org/stable/user_guide.html