Update CODE_OF_CONDUCT.md
Update CODE_OF_CONDUCT.md

Include reporting email address at the top as well as the bottom.
stonebig/bokeh,dennisobrien/bokeh,mindriot101/bokeh,ericmjl/bokeh,dennisobrien/bokeh,bokeh/bokeh,jakirkham/bokeh,timsnyder/bokeh,jakirkham/bokeh,jakirkham/bokeh,dennisobrien/bokeh,stonebig/bokeh,bokeh/bokeh,dennisobrien/bokeh,ericmjl/bokeh,dennisobrien/bokeh,mindriot101/bokeh,jakirkham/bokeh,mindriot101/bokeh,stonebig/bokeh,ericmjl/bokeh,timsnyder/bokeh,bokeh/bokeh,bokeh/bokeh,bokeh/bokeh,stonebig/bokeh,jakirkham/bokeh,mindriot101/bokeh,timsnyder/bokeh,ericmjl/bokeh,ericmjl/bokeh,timsnyder/bokeh,timsnyder/bokeh