Doesn't remove the old binary media types

[ol-mortezaebrahimi]

When changing the binary media types, the old media types still exist in the list of media types. I guess that's because we're merging the types instead of overwriting it.

My new serverless configurations :

    types:           #list of mime-types
      - "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
      - "application/pdf"```