Update README.md

Author: dimgold

README.md

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 # ETL with Python and MySQL
 ETL with Python Training - Taught by me during [Data Warehousing course - Tel Aviv University 2017](http://www30.tau.ac.il/yedion/syllabuse.asp?course=0571417202)
 
-### The Training is planned for ~2 hours and containing 3 notebook files:
+### The Training is planned for ~2 hours and contains 4 notebook files:
 * **[jupyter-notebook.ipynb](/jupyter-notebook.ipynb)** - quick Jupiter notebook introduction and tutorial
 * **[Mysql-io.ipynb](/Mysql-io.ipynb)**   - Input/Output to MySQL using [``MySQLdb`` connector](http://mysql-python.sourceforge.net/MySQLdb.html)
 * **[ETL with Python.ipynb](/ETL%20with%20Python.ipynb)**  - ETL with python using [``petl``](https://petl.readthedocs.io/en/latest/) package