Move syntax-dynamic-import to stage-3

[dkaoster]

Q	A
Patch: Bug Fix?	no
Major: Breaking Change?	no
Minor: New Feature?	no
Deprecations?	no
Spec Compliancy?	no
Tests Added/Pass?	yes
Fixed Tickets	Fixes #5607
License	MIT
Doc PR	no
Dependency Changes	no

Moves syntax-dynamic-import from stage-2 to stage-3

[mention-bot]

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

[codecov]

Codecov Report

Merging #5610 into 7.0 will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              7.0    #5610      +/-   ##
==========================================
+ Coverage   84.39%   84.43%   +0.03%     
==========================================
  Files         285      285              
  Lines        9647     9647              
  Branches     2710     2710              
==========================================
+ Hits         8142     8145       +3     
+ Misses       1003     1000       -3     
  Partials      502      502

Impacted Files	Coverage Δ
packages/babel-preset-stage-2/src/index.js	100% <ø> (ø)	⬆️
packages/babel-preset-stage-3/src/index.js	100% <ø> (ø)	⬆️
packages/babel-traverse/src/path/context.js	85.34% <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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[hzoo]

Thanks!!