attempt to fix error

Author: thomasWeise

styles/listing.sty

@@ -51,6 +51,7 @@ literate=%
 {€}{{\EUR}}1 {£}{{\pounds}}1 {«}{{\guillemotleft}}1%
 {»}{{\guillemotright}}1 {ñ}{{\~n}}1 {Ñ}{{\~N}}1 {¿}{{?`}}1%
 {…}{{\ldots}}1 {≥}{{>=}}1 {≤}{{<=}}1 {„}{{\glqq}}1 {“}{{\grqq}}1%
+{━}{{\textbf{-}}}1%
 {”}{{''}}1%
 {α}{{$\alpha$}}1 {β}{{$\beta$}}1 {γ}{{$\gamma$}}1 {δ}{{$\delta$}}1%
 {ε}{{$\epsilon$}}1 {ζ}{{$\zeta$}}1 {η}{{$\eta$}}1 {θ}{{$\theta$}}1%