Revert "Merge pull request #987 from yoyama/update_bintray_plugin"
Revert "Merge pull request #987 from yoyama/update_bintray_plugin"

This reverts commit 32dd75ca3bab8341594b37eef3cc9c96d9281b4f, reversing
changes made to 41cc6076b788d8a3d4e3232bd844312445e0fad7.

treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag,treasure-data/digdag