Simple fixes in README.md

[kose-y]

No description provided.

[codecov-io]

Codecov Report

Merging #10 into master will increase coverage by 0.75%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   81.66%   82.41%   +0.75%     
==========================================
  Files           1        1              
  Lines         180      182       +2     
==========================================
+ Hits          147      150       +3     
+ Misses         33       32       -1

Impacted Files	Coverage Δ
src/mpimanager.jl	82.41% <0%> (+0.75%)	⬆️

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[simonbyrne]

Thanks!