Update README.md

add link to JIRA Bugtracker
add gradle lint config
Merge pull request #968 from Catrobat/adaptGradleBuildfile

add gradle lint config
Merge pull request #967 from Catrobat/drone2

add Parrot Drone2 Features
Project upload disabled
Drone: App name changed to >Pocket Drone<
Drone enable drone feature by default
Drone rename application package
Drone: reset config to default on connect