tsibble v0.3.0

The tsibble package has a hexagon logo now! Thanks Mitch (@mitchelloharawild).

New functions

• New difference() computes lagged differences of a numeric vector. It returns a vector of the same length as the input with NA padded. It works with mutate().
• Added the support of gather()/spread(), nest()/unnest() to tbl_ts.

Defunct

• retired tsummarise().

Internal changes

• If index2 deviates from index (using index_by()), the index2 will be part of grouping variables.