node 8.x

[mapsam]

Adds node 8.x support #77

[mapsam]

Binaries published successfully, installing with node v8 looks 👍

~/mug/vtquery-nodev8$ npm install @mapbox/vtquery@0.2.0-nodev8test --save
npm WARN package.json vtquery-nodev8@1.0.0 No description
npm WARN package.json vtquery-nodev8@1.0.0 No repository field.
npm WARN package.json vtquery-nodev8@1.0.0 No README data
-
> @mapbox/vtquery@0.2.0-nodev8test install /Users/mapsam/mug/vtquery-nodev8/node_modules/@mapbox/vtquery
> node-pre-gyp install --fallback-to-build

[@mapbox/vtquery] Success: "/Users/mapsam/mug/vtquery-nodev8/node_modules/@mapbox/vtquery/lib/binding/vtquery.node" is installed via remote
@mapbox/vtquery@0.2.0-nodev8test node_modules/@mapbox/vtquery
└── nan@2.5.1