Update README.rst

[rowanc1]

Typo Equality --> Equally.

[welcome[bot]]

💖 Thanks for opening your first pull request! 💖

Please make sure you read the following:

• Authorship Guidelines: Our rules for giving you credit for your contributions, including authorship on publications and Zenodo archives.
• Contributing Guide: What the review process is like and our infrastructure for testing and documentation.
• Code of Conduct: How we expect people to interact in our projects.

A few things to keep in mind:

• Remember to run make format to make sure your code follows our style guide.
• If you need help writing tests, take a look at the existing ones for inspiration. If you don't know where to start, let us know and we'll walk you through it.
• All new features should be documented. It helps to write the docstrings for your functions/classes before writing the code. This will help you think about your code design and results in better code.
• No matter what, we are really grateful that you put in the effort to do this! ⭐

[welcome[bot]]

🎉🎉🎉 Congrats on merging your first pull request and welcome to the team! 🎉🎉🎉

If you would like to be added as a author on the Zenodo archive of the next release, make sure that you have added your full name, affiliation, and ORCID (optional) to the AUTHORS.md file of this repository.

We hope that this was a good experience for you. Let us know if there is any way that the contributing process could be improved.