Update README.md

README.md

@@ -468,7 +468,7 @@ See the file [MIGRATION_GUIDES.md](https://github.com/FlineDev/BartyCrouch/blob/
 
 Contributions are welcome. Feel free to open an issue on GitHub with your ideas or implement an idea yourself and post a pull request. If you want to contribute code, please try to follow the same syntax and semantic in your **commit messages** (see rationale [here](http://chris.beams.io/posts/git-commit/)). Also, please make sure to add an entry to the `CHANGELOG.md` file which explains your change.
 
-In order for the tests to run build issues, you need to run – also add an an API key in the new file to run the translations tests, too:
+In order for the tests to run build issues, you need to run – also add an API key in the new file to run the translations tests, too:
 ```shell
 cp Tests/BartyCrouchTranslatorTests/Secrets/secrets.json.sample Tests/BartyCrouchTranslatorTests/Secrets/secrets.json
 ```