Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -27,9 +27,9 @@ $ ./gradlew test --tests marquez.db.DatasetDaoTest
 Or run tests by category: 
 
 ```bash
-$ ./gradlew testUnit # runs unit tests
-$ ./gradlew testIntegration # runs integration tests
-$ ./gradlew testDataAccess # runs data access tests
+$ ./gradlew testUnit # run unit tests
+$ ./gradlew testIntegration # run integration tests
+$ ./gradlew testDataAccess # run data access tests
 ```
 
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