pillar 1.3.1

Bug fixes

• Fix off-by-one error in distribution of empty space (#141).

Visible changes

• NA in names is no longer escaped with backticks.
• Don't add quotes for pillars formatted with their format() method (tidyverse/tibble#448).

Internal changes

• Update base type abbrevs to rlang 0.3.0 (#140, @lionel-).
• Tests work again in a 256-color terminal (#129).