New features

• expose escape_html helper method for string manipulation to templates @awwong1 [#4581]
• list_tags: span element & custom class for label @noraj [#4578]

Fixes

• fix(load_plugins): ignore plugin whose name is started with "hexo-theme" @stevenjoezhang [#4592]
• fix(codeblock): closing code fence may be followed only by spaces @stevenjoezhang [#4574]

Refactor

• Replace process.mainModule with require.main @stevenjoezhang [#4583]

Docs

• docs(badge): replace david-dm with more reliable shields.io @curbengh [#4538]