Version 21.4.0

What's Changed

• fix: Multipage mode: <script> tag src attribute is incorrectly rewritten as .. by @JinDX in #653
• make emu-nt inline instead of inline-block so it is searchable in Chrome by @zhangenming in #651
• Remove support for <emu-normative-optional> element by @rkirsling in #642
• Add --max-clause-depth option @stevespringett in #656

Full Changelog: v21.3.1...v21.4.0