symbolize keys

[Ricoch]

Notes:

• This error popped when testing with the Megilla project using version 0.1.1 of the gem

Tasks:

• Increased version to 0.1.2
• Modified readme since it contained a few errors
• Added hash.symbolize_keys! since when using a hash with string keys keys the method attachment.delete(:data) does not work, check the following example: Also, even if using the delete method on a hash with string keys worked, when the attachment with string keys instead of symbols arrives to activestorage we receive the following error message:

   ArgumentError:
     wrong number of arguments (given 1, expected 0)
   # /Users/ricardocortio/.rvm/gems/ruby-2.4.1/gems/activestorage-5.2.2/app/models/active_storage/blob.rb:64:in `create_after_upload!'

  so I checked how this was working on rails. It seems the method create_blob_from has the following lines:

  when Hash
  ActiveStorage::Blob.create_after_upload!(attachable)

  and the method create_after_upload! receives keyword arguments, not positional arguments

  def create_after_upload!(io:, filename:, content_type: nil, metadata: nil)
    build_after_upload(io: io, filename: filename, content_type: content_type, metadata: metadata).tap(&:save!)
  end

  therefore when this hash was sent to this method we would get the previously mentioned argument error.

• After this change, the ABC for attachment_from_data got to 15.39/15, so I had to do some refactoring