Use object shorthand for properties

[LinusU]

This rule is on its way into the latest Standard ☺️

ref: https://github.com/standard/eslint-config-standard/pull/166

(re. Node.js compatibility: your package.json indicates that Node 0.10 is supported, but there is currently syntax in use that only works on Node.js 6.x, and the tests are run on 10.x. The syntax introduced in this PR is compatible with Node.js 4.x)

[coveralls]

Coverage remained the same at 87.671% when pulling c2cd1e03247806d900db5b1654ba07700dffcafe on LinusU:object-shorthand into 5bdda51e6d234aea41cc84642a413b8718ef7b8f on alanshaw:master.

[LinusU]

ping @alanshaw, any thoughts on merging this? ☺️