Update README

Swift: fixes after proto changes

Merge pull request mavlink#96 from Dronecode/add-info-2

Cartfile: update backend for info plugin

Fixed stall telemetry, core, camera and mission subscribtions

Merge pull request mavlink#88 from Dronecode/update-backend

carthage: update backend to 0.7.1

Updated Cartfile.resolved after bootstrap update

Merge pull request mavlink#86 from Dronecode/update-backend

Carthage: update backend to 0.6.1, carthage update

use compatible versions of backend for somehow automated updates

Merge pull request mavlink#83 from Dronecode/update-backend

Cartfile: bump backend to 0.2.7

Cartfile: set grpc-swift to a fixed commit before release 0.1.0