Fix typo in readme

[joseotoro]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1936 (fe8b14d) into master (c5eafcc) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1936      +/-   ##
==========================================
+ Coverage   93.03%   93.04%   +0.01%     
==========================================
  Files          77       77              
  Lines       16603    16603              
==========================================
+ Hits        15447    15449       +2     
+ Misses       1156     1154       -2     

Impacted Files	Coverage Δ
tests/test_cluster.py	98.29% <0.00%> (+0.12%)	⬆️

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[chayim]

Thanks @joseotoro for this!