Highlight *.pac files as JavaScript

closes #1515

CHANGELOG.md

@@ -29,6 +29,7 @@
 - Added Lean syntax, see #1446 (@Julian)
 - Added `.resource` extension for Robot Framework files, see #1386
 - Added `gnuplot` syntax, see #1431 (@sharkdp)
+- Highlight *.pac (Proxy auto-config) files as JavaScript, see #1515 (@sharkdp)
 
 ## New themes
 

src/syntax_mapping.rs

@@ -42,6 +42,9 @@ impl<'a> SyntaxMapping<'a> {
                 MappingTarget::MapTo("Bourne Again Shell (bash)"),
             )
             .unwrap();
+        mapping
+            .insert("*.pac", MappingTarget::MapTo("JavaScript (Babel)"))
+            .unwrap();
 
         // See #1008
         mapping