Fix multiline string token highlighting
Fix multiline string token highlighting

Fixes #153

Boddlnagg/VisualRust,drewet/VisualRust,tempbottle/VisualRust,drewet/VisualRust,Stitchous/VisualRust,Connorcpu/VisualRust,vadimcn/VisualRust,yacoder/VisualRust,cmr/VisualRust,dlsteuer/VisualRust,cmr/VisualRust,vosen/VisualRust,PistonDevelopers/VisualRust,dlsteuer/VisualRust,Vbif/VisualRust,xilec/VisualRust,Stitchous/VisualRust,yacoder/VisualRust,Boddlnagg/VisualRust,vadimcn/VisualRust,Vbif/VisualRust,PistonDevelopers/VisualRust,vosen/VisualRust,tempbottle/VisualRust,Connorcpu/VisualRust,xilec/VisualRust