prerequisites updated

Author: sonik8494

Big Mart Sales Prediction using Linear Regression/Prerequisites.md

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+# Prerequisites!
+
+**Following are the prerequisites:**
+
+   - Pandas
+   - Numpy
+   - Matplotlib
+   - Sklearn
+   - Regression
+   - Regularization
+
+Be prepared so that you can take most out of this session!
+All the best!