Lint is not returning the correct electron version number

[ThorstenHans]

When linting an existing App. Electron's current version is grabbed from https://atom.io/download/atom-shell/index.json.

From the JSON array, the first element is returned which must not be the recent version. Currently it's treating 1.3.7 as the current version because it's the first element in the array. Version 1.4.1 is the second one in the array.

So the lint-helpers should pay respect to the version property of each release listed in the array/