Fix code display in README
Fix code display in README

PingThingsIO/pt-mr-plotter,PingThingsIO/pt-mr-plotter,PingThingsIO/pt-mr-plotter,SoftwareDefinedBuildings/mr-plotter,SoftwareDefinedBuildings/mr-plotter,PingThingsIO/pt-mr-plotter,SoftwareDefinedBuildings/mr-plotter,SoftwareDefinedBuildings/mr-plotter,PingThingsIO/pt-mr-plotter,SoftwareDefinedBuildings/mr-plotter,SoftwareDefinedBuildings/mr-plotter,PingThingsIO/pt-mr-plotter,PingThingsIO/pt-mr-plotter