update drone.yml

drone.yml

     files:
       - src/radangel
       - src/contrib/websockify
-    file_exists: overwrite
-    checksum:
-      - md5
-      - sha1
-      - sha256
-      - sha512
-      - adler32
-      - crc32
-    draft: true
-    prerelease: true
-    note: CHANGELOG.md
-    title: Release
-    insecure: false
   when:
-    branch: master
     event: tag