v4.0.0

Changed

• Upgrade through2 devDependency from ^2.0.0 to ^3.0.0 (@vweevers)
• Upgrade readable-stream dependency from ^2.0.5 to ^3.0.2 (@ralphtheninja)
• Upgrade standard devDependency from ^11.0.0 to ^12.0.0 (@ralphtheninja)

Added

• Add nyc and coveralls (#39) (@ralphtheninja)

Removed

• Remove node 9 (@ralphtheninja)