Force proj4 < 2.4 because of source code incompatibility (#5938)
Force proj4 < 2.4 because of source code incompatibility (#5938)


schoolie/bokeh,percyfal/bokeh,aavanian/bokeh,schoolie/bokeh,ericmjl/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,dennisobrien/bokeh,jakirkham/bokeh,philippjfr/bokeh,schoolie/bokeh,bokeh/bokeh,bokeh/bokeh,stonebig/bokeh,Karel-van-de-Plassche/bokeh,Karel-van-de-Plassche/bokeh,rs2/bokeh,rs2/bokeh,Karel-van-de-Plassche/bokeh,bokeh/bokeh,jakirkham/bokeh,jakirkham/bokeh,philippjfr/bokeh,stonebig/bokeh,percyfal/bokeh,mindriot101/bokeh,schoolie/bokeh,schoolie/bokeh,percyfal/bokeh,ericmjl/bokeh,timsnyder/bokeh,rs2/bokeh,DuCorey/bokeh,philippjfr/bokeh,Karel-van-de-Plassche/bokeh,stonebig/bokeh,philippjfr/bokeh,mindriot101/bokeh,ericmjl/bokeh,DuCorey/bokeh,rs2/bokeh,mindriot101/bokeh,ericmjl/bokeh,mindriot101/bokeh,jakirkham/bokeh,jakirkham/bokeh,aavanian/bokeh,aavanian/bokeh,philippjfr/bokeh,ericmjl/bokeh,DuCorey/bokeh,percyfal/bokeh,timsnyder/bokeh,bokeh/bokeh,dennisobrien/bokeh,aavanian/bokeh,timsnyder/bokeh,dennisobrien/bokeh,rs2/bokeh,stonebig/bokeh,percyfal/bokeh,bokeh/bokeh,timsnyder/bokeh,timsnyder/bokeh,DuCorey/bokeh,DuCorey/bokeh,dennisobrien/bokeh,dennisobrien/bokeh