Add task to publish the current version number, implements #550

        }

    }

}

task postVersion {

    doLast {

        if (project.hasProperty('OPENTASKS_API_KEY')) {

            // publish version number on api.opentasks.app

            ((HttpURLConnection) new URL('https://opentasks-app.appspot.com/v1/app/latest_version/').openConnection()).with({

                requestMethod = 'POST'

                doOutput = true

                setRequestProperty('Content-Type', 'application/x-www-form-urlencoded')

                setRequestProperty('Authorization', "Token token=\"${OPENTASKS_API_KEY}\"")

                outputStream.withPrintWriter({ printWriter ->

                    printWriter.write("version_code=${project.android.defaultConfig.versionCode}&version_name=${project.android.defaultConfig.versionName}")

                })

                content

            })

        }

    }

}