• Add --title-bar-style flag (macOS only) (PR #627)
• Make the --counter regexp allow punctuation (e.g. "1,234") (fix #610, PR #626)
• Fix sites that use about:blank redirect technique (PR #623)
• Always open external links externally (fix #621 - PRs #622 #624)
• Only override the default window opening behavior when necessary (fix #616 - PR #620)
• Don't run tests on node 4 and 5, due to Jest not supporting those.
  In time, Nativefier will stop supporting them too and will enforce node>=6.
• Tests cleanups: use async/await, separate e2e tests, mocha -> jest.
• Use prettier for code formatting.