Add the following credentials to local.properties Your API key can be found here.
bintray.user=USERNAME bintray.key=APIKEY
Creating a release on jcenter is done by invoking the binaryUpload task. Note that you'll need to be a member of the appium organization on jcenter before publishing. Existing members are able to invite new ones.
Update the version number in build.gradle by modifying the value of ddVersion. Official releases should be made only after removing the -SNAPSHOT suffix. If the same version number is used as an existing release of droiddriver then jcenter will reject the upload.
gradle clean bintrayUpload