Log Message:
(math/R-prettyunits) Updated 1.0.2 to 1.1.1

# 1.1.1

* Fix spurious zero fractions in `pretty_bytes()` when formatting
  vectors of sizes (#23).

# 1.1.0

* `pretty_dt()`, `pretty_ms()` and `pretty_sec()` now handle `NA` values
  properly, and return `NA_character_` for them (#10, @petermeissner).

* `pretty_bytes()` now formats quantities just below the units better.
  E.g. 1MB - 1B is formatted as `"1 MB"` instead of `""1000 \ 
kB"` (#18).

* `pretty_bytes()` now has multiple styles. In particular, a fixed width
  style is useful for progress bars. Another style avoids the left-padding
  with spaces.

* The new low level `compute_bytes()` function can be used to create
  custom formatters for bytes.