Update default gems list at 4e72848 [ci skip]

Author: matzbot

NEWS.md

@@ -232,7 +232,7 @@ Note: We're only listing outstanding class updates.
     * cgi 0.3.3
     * date 3.2.3
     * erb 3.0.0
-    * error_highlight 0.4.0
+    * error_highlight 0.5.0
     * etc 1.4.0
     * fiddle 1.1.1
     * io-console 0.5.11