Fixed word used in README.md

[codemile]

I think you wanted to use "Rich" instead of "Reach"

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message was generated by yarn commit
• [ ] Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] Tests
[ ] Release
[ ] CI related changes
[x] Other... Please describe: Grammar/spelling

What is the current behavior?

Fix word in README

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information