enh(apache) support line continuation with \ (#4158)

Author: joshgoebel

CHANGES.md

@@ -7,6 +7,7 @@ CAVEATS / POTENTIALLY BREAKING CHANGES
 
 Core Grammars:
 
+- fix(apache) - support line continuation via `\` [Josh Goebel][]
 - fix(makefile) - allow strings inside `$()` expressions [aneesh98][]
 - enh(arcade) updated to ArcGIS Arcade version 1.29 [Kristian Ekenes][]
 - enh(css) add all properties listed on MDN (96 additions including `anchor-name`, `aspect-ratio`, `backdrop-filter`, `container`, `margin-trim`, `place-content`, `scroll-timeline`, ...) [BaliBalo][]

src/languages/apache.js

@@ -73,6 +73,10 @@ export default function(hljs) {
           relevance: 0,
           keywords: { literal: 'on off all deny allow' },
           contains: [
+            {
+              scope: "punctuation",
+              match: /\\\n/
+            },
             {
               className: 'meta',
               begin: /\s\[/,