Update .travis.yml

SaifJerbi · web-flow · commit cf5ca8c2b20c · 2017-06-27T16:54:58.000+02:00
refer to descriptor file
diff --git a/.travis.yml b/.travis.yml
@@ -22,3 +22,4 @@ deploy:
   provider: bintray
   user: $BINTRAY_USER
   key: $BINTRAY_KEY
+  file: ./package.json
