fix: force ignore coverage and public assets

mentioned in commit fe030da1

mentioned in merge request html-validate-angular!52 (merged)

mentioned in merge request protractor-html-validate!36 (merged)

mentioned in merge request stylish!1 (merged)

mentioned in merge request html-validate-jest-snapshot!33 (merged)

mentioned in merge request example-plugin!20 (merged)

mentioned in merge request grunt-html-validate!25 (merged)

mentioned in merge request vue-cli-plugin-html-validate!22 (merged)

mentioned in merge request semantic-release-config!15 (merged)

mentioned in merge request html-validate-vue!69 (merged)

mentioned in merge request dgeni-front-matter!24 (merged)

mentioned in merge request html-validate-vue-webpack-plugin!19 (closed)

mentioned in merge request html-validate-vue-webpack-plugin!21 (closed)

mentioned in merge request html-validate-vue-webpack-plugin!23 (merged)