Ruby 2.1.0: Digest::Digest is deprecated; use Digest

[dwiedenbruch]

Since Ruby 2.1.0 use of OpenSSL::Digest::Digest is deprecated.
Use OpenSSL::Digest instead.

CarrierWaveDirect::Uploader

    def signature
      Base64.encode64(
        OpenSSL::HMAC.digest(
          OpenSSL::Digest::Digest.new('sha1'),
          aws_secret_access_key, policy
        )
      ).gsub("\n","")
    end