v0.5.16

• Req.Test: Fix verify_on_exit! accidentally using Mox name
• auth: Support MFArgs
• auth: Support digest auth
• put_aws_sigv4: Support MFArgs
• put_path_params: Encode :path_params even with reserved characters
• put_path_params: Set :path_params_template on empty params
• run_plug: Handle compressed request body