Changed

• Upgrade nan from ~2.10.0 to ~2.12.1 (#596) (@vweevers)
• Upgrade prebuild-install from ^4.0.0 to ~5.2.4 (#596) (@vweevers)
• Upgrade prebuild devDependency from ^7.0.0 to ^8.1.2 (#596) (@vweevers)

Added

• Add Node.js 11 to Travis and AppVeyor (#596) (@vweevers)