message: [skip travis] Really redundant rustfmt update.
diff: +edition = "2018"
  max_width = 100
  newline_style = "Unix"
  reorder_imports = true
  @@ -8,5 +9,8 @@ hard_tabs = true
  merge_imports = true
  merge_derives = true
  reorder_modules = true
  -space_before_colon = true
  +reorder_impl_items = true
  tab_spaces = 4
  +format_strings = true
  +space_before_colon = true
  +space_after_colon = true
  