Update README.md

README.md

@@ -52,7 +52,7 @@ test_script (str) - The task's test suite as a python script to be run from the
 testbed_environment (str) - The python version used to run the test suite. 
 requirements_txt (str) - The pip package dependencies required to run the test suite.
 solution_commit (str) - The commit hash of the repository representing the HEAD of the repository immediately after the instruction was carried out.
-solution_patch (str) - The patch in the unified diff format representing the difference between the parent and solution commit.
+solution_patch (str) - The patch in the unified diff format representing the difference between the base and solution commit.
 modified_files (str) - A dictionary of files and their content that were modified by the solution commit.
 language (str) - The primary programming language of the repository.
 ```