4.0.0

• 979b4eb Refactor to use unist-util-lsp by @remcohaszing in #56
• 752400a Update dependencies by @remcohaszing in #57
• c3023e7 Add configuration option requireConfig by @remcohaszing in #43
• 9ab5368 Gracefully handle unified-engine errors by @remcohaszing in #63
• d7917d0 Document which files should be watched by @remcohaszing in #62
• e08051c Update vscode-languageserver to version 9
• Change to require Node.js 16

Full Changelog: 3.1.0...v4.0.0