Update .drone.yml

Author: cooperspencer

.drone.yml

@@ -29,7 +29,7 @@ steps:
       api_key:
         from_secret: github_token
       files:
-        - - ${DRONE_REPO_NAME}_${DRONE_TAG}.zip
+        - ${DRONE_REPO_NAME}_${DRONE_TAG}.zip
       checksum:
         - md5
         - sha1