Added prerequisite install for SWAT
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### Prerequisites
+- Python version 3 or greater is required
- Install DLPy using `pip install sas-dlpy` or `conda install -c sas-institute sas-dlpy`
+- Install SAS [Scripting Wrapper for Analytics Transfer (SWAT)](https://github.com/sassoftware/python-swat) for Python using `pip install swat` or `conda install -c sas-institute swat`
- Access to a SAS Viya 3.4 environment with [Visual Data Mining and Machine Learning](https://www.sas.com/en_us/software/visual-data-mining-machine-learning.html) (VDMML) is required
- A user login to your SAS Viya back-end is required. See your system administrator for details if you do not have a SAS Viya account.
-- Python version 3 or greater is required
- It is recommended that you install the open source graph visualization software called [Graphviz](https://www.graphviz.org/download/) to enable graphic visualizations of the DLPy deep learning models
### Getting Started
