New upstream version 42.2.6

.editorconfig

.github/issue_template.md

.github/pull_request_template.md

.travis.yml

.travis/travis_create_slaves.sh

CHANGELOG.md

CONTRIBUTING.md

README.md

TESTING.md

appveyor.yml

backend_protocol_v4_wanted_features.md

build.properties

certdir/README.md

contributors.json

docs/_posts/2017-02-20-42.0.0-release.md

docs/_posts/2018-01-17-42.2.0-release.md

docs/_posts/2018-07-12-42.2.3-release.md

docs/_posts/2018-08-27-42.2.5-release.md

docs/_posts/2019-06-19-42.2.6-release.md

docs/community/mailinglist.html