5.3.0
fix(migrator): fix help message
fix(codeblock): closing code fence may be followed only by spaces (#4574)
refactor: simplify code (#4138)
feat(helper): add `escape_html` (#4581)
feat(extend/injector): bring up new extend Injector (#4049)
chore(deps): update hexo-front-matter from 1.0.0 to 2.0.0 (#4439)
refactor(nunjucks): dedicated nunjucks renderer (#4356)
feat(highlight): parse 'caption' option to prismHighlight