Pin windows testing to mapnik@3.1.2 for now ...
Pin windows testing to mapnik@3.1.2 for now ...

nyurik/kartotherian,nyurik/tilelive-vector,kartotherian/kartotherian,mapbox/tilelive-vector,kartotherian/kartotherian,jaredbrookswhite/tilelive-vector,nyurik/kartotherian,kartotherian/kartotherian,nyurik/kartotherian,nyurik/kartotherian,kartotherian/kartotherian