Minor M1 change and fix README plot

[chriselrod]

No description provided.

[codecov]

Codecov Report

Merging #87 (1590cbc) into master (9265bb7) will decrease coverage by 1.51%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   87.88%   86.37%   -1.52%     
==========================================
  Files          11       11              
  Lines         652      653       +1     
==========================================
- Hits          573      564       -9     
- Misses         79       89      +10     

Impacted Files	Coverage Δ
src/init.jl	69.56% <33.33%> (+1.38%)	⬆️
src/matmul.jl	90.00% <100.00%> (-0.75%)	⬇️
src/global_constants.jl	42.00% <0.00%> (-18.00%)	⬇️
src/block_sizes.jl	96.61% <0.00%> (+1.69%)	⬆️

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