Lowercase "business model" in badge

[Daniel15]

For consistency with the other badges

Also removed a stray quotation mark.

[codecov]

Codecov Report

Merging #5729 into 7.0 will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              7.0   #5729      +/-   ##
=========================================
+ Coverage   84.59%   84.6%   +0.01%     
=========================================
  Files         282     282              
  Lines        9861    9861              
  Branches     2766    2766              
=========================================
+ Hits         8342    8343       +1     
+ Misses        999     998       -1     
  Partials      520     520

Impacted Files	Coverage Δ
packages/babel-traverse/src/path/context.js	86.2% <0%> (+0.86%)	⬆️

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[Daniel15]

TIL I can increase code coverage by editing the readme. ಠ_ಠ

[xtuc]

Thanks for your PR 👍