Fix typo in README regarding libopus

[btriller]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.39%. Comparing base (0460b40) to head (4002e7e).
⚠️ Report is 211 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #572      +/-   ##
==========================================
- Coverage   65.25%   64.39%   -0.87%     
==========================================
  Files          51       34      -17     
  Lines        6588     6423     -165     
==========================================
- Hits         4299     4136     -163     
+ Misses       1915     1871      -44     
- Partials      374      416      +42     

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