Correct a grammatical error

Author: oskarlh

README.md

@@ -7,4 +7,4 @@ The test coverage is a perfect 100% and enforced by the publishing and pull requ
 ## Contributing
 Contributions are welcomed! Feel free to make a pull request. Please add your name to `contributors` in `package.json` and run `npm run build-and-verify` before submitting your PR. By making a pull request you agree to license your contribution under [the CC0 license](https://creativecommons.org/publicdomain/zero/1.0/legalcode.en#legal-code-title) unless otherwise specified.
 
-ESLint is used to enforce code quality and consistent formatting (with the help of Prettier). If ESLint complains when you run `npm run build-and-verify`, you can run `npm run lint-fix` to apply automatic fixes and and then fix the rest of the errors manually. I recommend configuring your IDE for ESLint and Prettier. If you are using Visual Studio Code, simply installing [Microsoft's ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) and [the official Prettier extension](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode) takes care of that.
+ESLint is used to enforce code quality and consistent formatting (with the help of Prettier). If ESLint complains when you run `npm run build-and-verify`, you can run `npm run lint-fix` to apply automatic fixes and then fix the rest of the errors manually. I recommend configuring your IDE for ESLint and Prettier. If you are using Visual Studio Code, simply installing [Microsoft's ESLint extension](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) and [the official Prettier extension](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode) takes care of that.