Bump notebook from 5.6.0 to 6.4.1 in /reproducibility-updates/2019-04-10/analysis/jupyter#8

dependabot[bot] wants to merge 1 commit intomasteripv6hitlist/ipv6hitlist.github.io:masterfrom

dependabot/pip/reproducibility-updates/2019-04-10/analysis/jupyter/notebook-6.4.1ipv6hitlist/ipv6hitlist.github.io:dependabot/pip/reproducibility-updates/2019-04-10/analysis/jupyter/notebook-6.4.1Copy head branch name to clipboard