Suggestion to fix grammar in README.md

[prosoitos]

No description provided.

[codecov]

Codecov Report

Merging #212 (a47c602) into master (eecbf8b) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
- Coverage   90.75%   90.63%   -0.13%     
==========================================
  Files          22       22              
  Lines         519      523       +4     
==========================================
+ Hits          471      474       +3     
- Misses         48       49       +1     

Flag	Coverage Δ
unittests	90.63% <ø> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core.jl	80.95% <0.00%> (-1.41%)	⬇️

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[tkf]

Thanks!