Added some special characters that can be used in listings (…, ≥, ≤, „, “,”).

eisvogel.latex

@@ -480,6 +480,8 @@ $if(listings)$
   {ç}{{\c c}}1 {Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
   {€}{{\EUR}}1 {£}{{\pounds}}1 {«}{{\guillemotleft}}1
   {»}{{\guillemotright}}1 {ñ}{{\~n}}1 {Ñ}{{\~N}}1 {¿}{{?`}}1
+  {…}{{\ldots}}1 {≥}{{>=}}1 {≤}{{<=}}1 {„}{{\glqq}}1 {“}{{\grqq}}1
+  {”}{{''}}1
 }
 \lstset{style=eisvogel_listing_style}