Modernize

[KieranHolroyd]

Changes:

• Update to Babel 7
• Bump Required Node Version: 16.0.0
• Change usage pattern slightly
  • npm start <your-repo-path>
  • npm start ~/repository
  • npm run gitlogg ~/projects
• Change yourpath variable to $1 to allow the CLI argument
• Fix some simple type errors (<3 typescript) @ts-check
• Update all dependencies and remove all npm security warning messages.