Fix babel-plugin-transform-regenerator README

[k15a]

Q	A
Patch: Bug Fix?	no
Major: Breaking Change?	no
Minor: New Feature?	no
Deprecations?	no
Spec Compliancy?	yes
Tests Added/Pass?	no
Fixed Tickets
License	MIT
Doc PR	yes
Dependency Changes	no

[mention-bot]

@k15a, thanks for your PR! By analyzing the history of the files in this pull request, we identified @hzoo, @xtuc and @existentialism to be potential reviewers.

[existentialism]

@k15a thanks!

[codecov]

Codecov Report

Merging #5852 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5852      +/-   ##
==========================================
+ Coverage   84.75%   84.78%   +0.03%     
==========================================
  Files         204      204              
  Lines        9608     9608              
  Branches     2702     2702              
==========================================
+ Hits         8143     8146       +3     
+ Misses        981      978       -3     
  Partials      484      484

Impacted Files	Coverage Δ
packages/babel-traverse/src/path/context.js	85.34% <0%> (ø)	⬆️
...bel-plugin-transform-es2015-classes/src/vanilla.js	90.59% <0%> (+0.42%)	⬆️
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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