rising(src, len, _id) {
        let id = this._tsid(_id, `rising(${len})`)
        let top = src[0]
        for (var i = 1; i < len + 1; i++) {
            if (top <= src[i]) {
                return this.ts(false, id, src.__tf__)
            }
        }
        return this.ts(true, id, src.__tf__)
    }
Test if "src" TS is rising for "len" candles
@param {TS} src - Input
@param {number} len - Length
@return {TS} - New time-series