Reference of v4 song rating

arguments	description	optional
start	range of start	NO
end	range of end	YES

Explain

Return all the song ids who matched the given rating range.

Return data

{
    "status": 0,
    "content": {
        "rating": [
            {
                "sid": "fractureray",
                "rating": 11.2,
                "rating_class": 2,
                "difficulty": 22
            },
            {
                "sid": "grievouslady",
                "rating": 11.3,
                "rating_class": 2,
                "difficulty": 22
            },
            {
                "sid": "tempestissimo",
                "rating": 11.5,
                "rating_class": 3,
                "difficulty": 22
            }
        ]
    }
}

Error status

status	description
0	everything is OK
-1	invalid range start of the rating
-2	invalid range start of the rating
-3	invalid range end of the rating
-4	range of rating end smaller than its start
-5	unknown error occurred
-233	unknown error occurred