Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/masterminds/html5/RELEASE.md

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+# Release Notes
+2.1.2 (2015-06-07)
+- #82: Support for PHP7
+- #84: Improved boolean attribute handling 
+
+2.1.1 (2015-03-23)
+- #78: Fixes bug where unmatched entity like string drops everything after &.
+
+2.1.0 (2015-02-01)
+- #74: Added `disable_html_ns` and `target_doc` dom parsing options
+- Unified option names
+- #73: Fixed alphabet, ß now can be detected
+- #75 and #76: Allow whitespace in RCDATA tags
+- #77: Fixed parsing blunder for json embeds
+- #72: Add options to HTML methods
+
+2.0.2 (2014-12-17)
+- #50: empty document handling
+- #63: tags with strange capitalization
+- #65: dashes and underscores as allowed characters in tag names
+- #68: Fixed issue with non-inline elements inside inline containers
+
+2.0.1 (2014-09-23)
+- #59: Fixed issue parsing some fragments.
+- #56: Incorrectly saw 0 as empty string
+- Sami as new documentation generator
+
+2.0.0 (2014-07-28)
+- #53: Improved boolean attributes handling
+- #52: Facebook HHVM compatibility
+- #48: Adopted PSR-2 as coding standard
+- #47: Moved everything to Masterminds namespace
+- #45: Added custom namespaces
+- #44: Added support to XML-style namespaces
+- #37: Refactored HTML5 class removing static methods
+
+1.0.5 (2014-06-10)
+- #38: Set the dev-master branch as the 1.0.x branch for composer (goetas)
+- #34: Tests use PSR-4 for autoloading. (goetas)
+- #40, #41: Fix entity handling in RCDATA sections. (KitaitiMakoto)
+- #32: Fixed issue where wharacter references were being incorrectly encoded in style tags.
+
+1.0.4 (2014-04-29)
+- #30/#31 Don't throw an exception for invalid tag names.
+
+1.0.3 (2014-02-28)
+- #23 and #29: Ignore attributes with illegal chars in name for the PHP DOM.
+
+1.0.2 (2014-02-12)
+- #23: Handle missing tag close in attribute list.
+- #25: Fixed text escaping in the serializer (HTML% 8.3).
+- #27: Fixed tests on Windows: changed "\n" -> PHP_EOL.
+- #28: Fixed infinite loop for char "&" in unquoted attribute in parser.
+- #26: Updated tag name case handling to deal with uppercase usage.
+- #24: Newlines and tabs are allowed inside quoted attributes (HTML5 8.2.4).
+- Fixed Travis CI testing.
+
+1.0.1 (2013-11-07)
+- CDATA encoding is improved. (Non-standard; Issue #19)
+- Some parser rules were not returning the new current element. (Issue #20)
+- Added, to the README, details on code test coverage and to packagist version.
+- Fixed processor instructions.
+- Improved test coverage and documentation coverage.
+
+1.0.0 (2013-10-02)
+- Initial release.