round(decimals: number = 0): Series {
    return new Series(this.values.map(v => round10(v, -1 * decimals)));
  }
Return a `Series` with all values rounded to the nearest precision specified by decimals

pandas equivalent: [Series.round](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.round.html)

@param {number} decimals=0
 Number of decimals to round to

@example
const ds = new Series([1.25, 1.47, 1.321])

// Returns Series([1.3, 1.5, 1.3])
ds.round(1);