Correct the over replacement from Libra to Diem
Closes:
-> **Note to readers:** On December 1, 2020, the Diem Association was renamed to Diem Association. The project repos are in the process of being migrated. All projects will remain available for use here until the migration to a new GitHub Organization is complete.
+> **Note to readers:** On December 1, 2020, the Libra Association was renamed to Diem Association. The project repos are in the process of being migrated. All projects will remain available for use here until the migration to a new GitHub Organization is complete.
<a href="https://developers.diem.com">
<img width="200" src="./.assets/diem.png" alt="Diem Logo" />
