Fix typo in readme (#2838)
Fix typo in readme (#2838)

Co-authored-by: Abe Gong <606b3359dc1d92e5a8e085e6dddd4e8008f0f543@users.noreply.github.com>
great-expectations/great_expectations,great-expectations/great_expectations,great-expectations/great_expectations,great-expectations/great_expectations