Minor Changes

• Drop node v2, add v7: 6048e68
• Support Node.js 9.x: #439
• Travis: drop Node 0.10 and 0.12, add Node 8 and 9: 60282c2

Patches

• Test: add nodejs_version for node v8: #431

Credits

Huge thanks to @zhaoda and @waitingsong for helping!