Add chomp option to IO.readlines

[ybiquitous]

This PR adds the chomp option of the IO.readlines method signature.

$ irb
irb(main):001:0> IO.write 'foo.txt', [1, 2, 3].join("\n")
=> 5
irb(main):002:0> IO.readlines 'foo.txt'
=> ["1\n", "2\n", "3"]
irb(main):003:0> IO.readlines 'foo.txt', chomp: true
=> ["1", "2", "3"]
irb(main):004:0> IO.readlines 'foo.txt', chomp: false
=> ["1\n", "2\n", "3"]
irb(main):005:0> IO.readlines 'foo.txt', chomp: nil
=> ["1\n", "2\n", "3"]

See also https://ruby-doc.org/core-3.0.2/IO.html#readlines-method

[soutaro]

👍