Bump notebook from 6.0.3 to 6.4.12 in /elections_2016#15

dependabot[bot] wants to merge 1 commit intomastermarekmansell/tutorial-data:masterfrom

dependabot/pip/elections_2016/notebook-6.4.12marekmansell/tutorial-data:dependabot/pip/elections_2016/notebook-6.4.12Copy head branch name to clipboard