Error in v1.8.0 - uninitialized constant Terminal::Table::Cell::Unicode (NameError)

[DannyBen]

I am getting an error with version 1.8.0, while version 1.7.3 does not seem to have the problem.
I never had this error before, perhaps I had version 1.7.3 installed before today.

Code

require 'terminal-table'

rows = []
rows << ['One', 1]
rows << ['Two', 2]
rows << ['Three', 3]
table = Terminal::Table.new rows: rows
puts table

Error

uninitialized constant Terminal::Table::Cell::Unicode (NameError)

Error Location

terminal-table/lib/terminal-table/cell.rb

Lines 70 to 72 in e00dde3

	def value_for_column_width_recalc
	lines.map{ |s| escape(s) }.max_by{ |s| Unicode::DisplayWidth.of(s) }
	end

Backtrace

Traceback (most recent call last):
        19: from test.rb:8:in `<main>'
        18: from test.rb:8:in `puts'
        17: from test.rb:8:in `puts'
        16: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:142:in `render'
        15: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:142:in `map'
        14: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:142:in `block in render'
        13: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/separator.rb:6:in `render'
        12: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/separator.rb:6:in `map'
        11: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/separator.rb:7:in `block in render'
        10: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:97:in `column_width'
         9: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:339:in `column_widths'
         8: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:201:in `recalc_column_widths'
         7: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:201:in `each'
         6: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:203:in `block in recalc_column_widths'
         5: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:203:in `each'
         4: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/table.rb:204:in `block (2 levels) in recalc_column_widths'
         3: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/cell.rb:71:in `value_for_column_width_recalc'
         2: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/cell.rb:71:in `max_by'
         1: from /store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/cell.rb:71:in `each'
/store/gems/ruby-2.5.0/gems/terminal-table-1.8.0/lib/terminal-table/cell.rb:71:in `block in value_for_column_width_recalc': uninitialized constant Terminal::Table::Cell::Unicode (NameError)

System info

Ruby: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]
RVM: rvm 1.29.3 (latest) by Michal Papis, Piotr Kuczynski, Wayne E. Seguin [https://rvm.io]
Bundler: Bundler version 1.17.2
OS: Ubuntu 16.04.5 LTS

[nanobowers]

@DannyBen I think you need to install the unicode-display_width gem first. From the terminal-table.gemspec:

spec.add_runtime_dependency "unicode-display_width", ["~> 1.1", ">= 1.1.1"]