Update README.md

Author: SaraBaradaran

README.md

@@ -36,7 +36,7 @@ Now install project requirements using `requirements.txt` file:
 ```
 pip install -r requirements.txt
 ```
-Running Tests Cases
+Running Test Cases
 ------------
 Everything is completed. Now you can test your desired code using our tool. We put some test cases from the [NIST SARD](https://samate.nist.gov/SRD/) benchmark vulnerable programs in this repository by which you can test our vulnerability detection tool.
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