fix vim syntax highlighting for multiline strings
fix vim syntax highlighting for multiline strings

Dimenus/zig,Dimenus/zig,raulgrell/zig,andrewrk/zig,Dimenus/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,raulgrell/zig