Fix transform-object-rest-spread README

[existentialism]

No description provided.

[mention-bot]

@existentialism, thanks for your PR! By analyzing the history of the files in this pull request, we identified @lukyth, @xtuc and @hzoo to be potential reviewers.

[codecov]

Codecov Report

Merging #5409 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5409      +/-   ##
==========================================
+ Coverage   84.42%   84.47%   +0.05%     
==========================================
  Files         204      204              
  Lines        9594     9594              
  Branches     2693     2693              
==========================================
+ Hits         8100     8105       +5     
+ Misses       1007     1002       -5     
  Partials      487      487

Impacted Files	Coverage Δ
...bel-plugin-transform-es2015-classes/src/vanilla.js	90.59% <0%> (+0.85%)	✅
packages/babel-traverse/src/path/context.js	86.2% <0%> (+0.86%)	✅
packages/babel-traverse/src/path/modification.js	74.75% <0%> (+0.97%)	✅
packages/babel-helper-call-delegate/src/index.js	68% <0%> (+4%)	✅

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[lukyth]

LGTM! 👍