chore(queries): Highlight enum as keyword

jcs090218 · meain · commit 11d1b78e0ce9 · 2022-09-25T15:49:40.000+05:30
diff --git a/queries/php/highlights.scm b/queries/php/highlights.scm
@@ -97,6 +97,7 @@
  "default"
  "echo"
  "enddeclare"
+ "enum"
  "extends"
  "final"
  "global"
