Update node:8 Docker digest to 6d6c00 (#3024)
Update node:8 Docker digest to 6d6c00 (#3024)


nteract/nteract,nteract/composition,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,jdfreder/nteract,nteract/composition,rgbkrk/nteract,rgbkrk/nteract,rgbkrk/nteract,jdfreder/nteract,nteract/composition,nteract/nteract,nteract/nteract