Correct spelling mistake in README

[Kjir]

TODOs:

• [ ] Commits have meaningful description, they are relatively small.
• [ ] PR have meaningful description.
• [ ] Fixed or added new code.
• [ ] Covered changes with tests (should be close to 100% coverage for new code).
• [ ] Code is well-documented (public functions have @doc blocks).
• [ ] If environment variables were added, .env and annon.infra is changed correspondingly.

If you submit new feature:

• [ ] Describe a use-case for this feature.
• [ ] Documentation in README.md and apiary.apib is updated to match latest changes.

[AndrewDryga]

Hello, @Kjir! This is your first Pull Request that will be reviewed by Ebert, an automatic Code Review service. It will leave comments on this diff with potential issues and style violations found in the code as you push new commits. You can also see all the issues found on this Pull Request on its review page. Please check our documentation for more information.

[AndrewDryga]

Thank you 👍