Sort the import line alphabetically

[harysutanto]

It would be nice if the plugin could insert the new import ... alphabetically. For example we have current import lines:

import CoreGraphics
import Foundation
import UIKit

if we're to add a new import line like import CoreLocation, it would be like this:

import CoreGraphics
import CoreLocation
import Foundation
import UIKit

[markohlebar]

Hey @harysutanto yeah that makes perfect sense I think. I think we can plan this into the next release :)