add_new_periods: Add New Periods
In dataobservatory-eu/indicator: Tidy Statistical Indicators

Create a time series object from tmp in approximation functions.

1	add_new_periods(indic, years = NULL, days = NULL)

`indic`	A temporary indicator table created by an approximation function.
`years`	The number of years to add to the indicator's data frame. Positive values add after the last observed time, negative values add before the first observed time.
`days`	The number of years to add to the indicator's data frame. Positive values add after the last observed time, negative values add before the first observed time.