…mp-shadow-dom-updated

* 'develop' of github.com:ampproject/amp-wp: (233 commits)
  Ignore Story editor tests (ampproject#4043)
  Update dependency eslint-plugin-jest to v23.4.0 (ampproject#4056)
  Update dependency xwp/wp-dev-lib to v1.4.0
  Update amp-video embed regex pattern to include other Vimeo URL formats (ampproject#4051)
  Update amp-instagram embed regex (ampproject#4053)
  Update dependency terser-webpack-plugin to v2.3.2 (ampproject#4047)
  Fix ability to update the status of a validation error
  Update wp-dev-lib package (ampproject#4029)
  Update dependency core-js to v3.6.2 (ampproject#4028)
  Update dependency @wordpress/element to v2.10.0 (ampproject#3986)
  Update dependency browserslist to v4.8.3 (ampproject#4021)
  Update dependency grunt-http to v2.3.3 (ampproject#4022)
  Update dependency postcss to v7.0.26 (ampproject#4017)
  Update dependency eslint-utils to v2 (ampproject#4012)
  Update dependency eslint-plugin-jest to v23.3.0 (ampproject#4016)
  Update dependency css-loader to v3.4.1 (ampproject#4023)
  Update dependency webpack to v4.41.5 (ampproject#4014)
  Update dependency core-js to v3.6.1 (ampproject#4011)
  Update dependency eslint to v6.8.0 (ampproject#4002)
  Swap PHP 5.4 for 5.6 to run external-http tests
  ...

* add/spa-amp-shadow-dom: (3410 commits)
  Improve copy in comment and error message
  Reuse constant
  Revert introduction of amp_document_output filter for now
  attachShadowDocAsStream expects a string type variable
  AppShell polyfill: Update to latest version - 2.4.1
  Add a filter to allow altering AMP output from themes
  Ensure .site-content-contain element exists
  Amp-Wp-App-Shell - Improve flexibility for different types of caching
  AppShell polyfill: Update to latest version - 2.4.0
  Fix eslint issues
  Fix build and unit tests by preserving uncompiled scripts
  Make use of new Amp\AmpWP\Document methods; add line breaks
  Restore missing live_list_offline_commenting to AMP_Service_Worker
  Fix phpcs linting issues
  Add missing changes to style sanitizer; remove duplicated autoloader entry
  Ignore Story editor tests (ampproject#4043)
  Update dependency eslint-plugin-jest to v23.4.0 (ampproject#4056)
  Update dependency xwp/wp-dev-lib to v1.4.0
  Update amp-video embed regex pattern to include other Vimeo URL formats (ampproject#4051)
  Update amp-instagram embed regex (ampproject#4053)
  ...

# Conflicts:
#	composer.json

* xwp/add/spa-amp-shadow-dom: (250 commits)
  Improve copy in comment and error message
  Reuse constant
  Revert introduction of amp_document_output filter for now
  attachShadowDocAsStream expects a string type variable
  AppShell polyfill: Update to latest version - 2.4.1
  Add a filter to allow altering AMP output from themes
  Ensure .site-content-contain element exists
  Amp-Wp-App-Shell - Improve flexibility for different types of caching
  AppShell polyfill: Update to latest version - 2.4.0
  Fix eslint issues
  Fix build and unit tests by preserving uncompiled scripts
  Make use of new Amp\AmpWP\Document methods; add line breaks
  Restore missing live_list_offline_commenting to AMP_Service_Worker
  Fix phpcs linting issues
  Add missing changes to style sanitizer; remove duplicated autoloader entry
  Ignore Story editor tests (ampproject#4043)
  Update dependency eslint-plugin-jest to v23.4.0 (ampproject#4056)
  Update dependency xwp/wp-dev-lib to v1.4.0
  Update amp-video embed regex pattern to include other Vimeo URL formats (ampproject#4051)
  Update amp-instagram embed regex (ampproject#4053)
  ...

# Conflicts:
#	Gruntfile.js
#	assets/js/amp-wp-app-shell.js
#	includes/amp-helper-functions.php