* master:
  make installing runtime/transform-runtime clearer [skip ci] (babel#4991)
  Add example to es2015-unicode-regex [skip ci] (babel#4983)
  v6.20.3
  Calculate the correct arity for async functions with destructuring - fixes babel#4977 (babel#4978)
  v6.20.2
  fix object spread (babel#4976)
  fix clean lib
  update readme [skip ci]
  v6.20.1
  Fix nested object spread (babel#4974)
  v6.20.0
  v6.20.0 changelog [skip ci] (babel#4971)
  Raise limit on code size before compacting (babel#4965)
  Use regenerator-transform to implement babel-plugin-transform-regenerator (babel#4881)
  Add getBindingIdentifierPaths/getOuterBindingIdentifierPaths (babel#4876)
  Hoist generateDeclaredUidIdentifier helper function (babel#4934)

* modules-commonjs-spec: (67 commits)
  Remove accidental !
  Be more proactive with the Invalid import throw
  Convert spec-test-helpers to ES6
  Avoid calling scope.getBinding on Flow types
  Remove unused variable, update fixture
  Huge refactoring; reimplement spec / specImport modes with visitors
  Build the babel-runtime dist scripts from current code
  transform-runtime: flag blacklisted helpers for skipping transform
  Allow the helperGenerator hook to return the helper itself
  Fix order in options.json; test still failing
  Add failing test (fix TODO)
  Fix crash when processing ThisExpression
  Update fixtures
  Use a helper for the SameValue check
  Update fixtures
  Use better SameValue algorithm
  Use propertyIsEnumerable instead of getOwnPropertyDescriptor
  Add missing before hooks; fix tests failing on Node < 6
  make installing runtime/transform-runtime clearer [skip ci] (babel#4991)
  Check if renamed reexports are correctly exported
  ...

* master: (89 commits)
  fix sizing [skip ci]
  typo [skip ci]
  changelog for v6.20.1 to v6.20.3 [skip ci]
  mention repl/link [skip ci]
  add semver label [skip ci]
  Fix links in CONTRIBUTING.md [skip ci] (babel#4989)
  make installing runtime/transform-runtime clearer [skip ci] (babel#4991)
  Add example to es2015-unicode-regex [skip ci] (babel#4983)
  v6.20.3
  Calculate the correct arity for async functions with destructuring - fixes babel#4977 (babel#4978)
  v6.20.2
  fix object spread (babel#4976)
  fix clean lib
  update readme [skip ci]
  v6.20.1
  Fix nested object spread (babel#4974)
  v6.20.0
  v6.20.0 changelog [skip ci] (babel#4971)
  Raise limit on code size before compacting (babel#4965)
  Use regenerator-transform to implement babel-plugin-transform-regenerator (babel#4881)
  ...