Correct typo in data_transformations.md (#289)

Author: dhempy

Diff for: docs/data_transformations.md

@@ -51,7 +51,7 @@ It can happen that after all transformations, a row of the CSV file would produc
 
 By default SmarterCSV uses `remove_empty_hashes: true` to remove these empty hashes from the result.
 
-This can be set to `true`, to keep these empty hashes in the results.
+This can be set to `false`, to keep these empty hashes in the results.
 
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