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Returns a new string copied from +self+, with trailing characters possibly removed:
When +line_sep+ is <tt>"\n"</tt>, removes the last one or two characters
if they are <tt>"\r"</tt>, <tt>"\n"</tt>, or <tt>"\r\n"</tt>
(but not <tt>"\n\r"</tt>):
$/ # => "\n"
"abc\r".chomp # => "abc"
"abc\n".chomp # => "abc"
"abc\r\n".chomp # => "abc"
"abc\n\r".chomp # => "abc\n"
"тест\r\n".chomp # => "тест"
"こんにちは\r\n".chomp # => "こんにちは"
When +line_sep+ is <tt>''</tt> (an empty string),
removes multiple trailing occurrences of <tt>"\n"</tt> or <tt>"\r\n"</tt>
(but not <tt>"\r"</tt> or <tt>"\n\r"</tt>):
"abc\n\n\n".chomp('') # => "abc"
"abc\r\n\r\n\r\n".chomp('') # => "abc"
"abc\n\n\r\n\r\n\n\n".chomp('') # => "abc"
"abc\n\r\n\r\n\r".chomp('') # => "abc\n\r\n\r\n\r"
"abc\r\r\r".chomp('') # => "abc\r\r\r"
When +line_sep+ is neither <tt>"\n"</tt> nor <tt>''</tt>,
removes a single trailing line separator if there is one:
'abcd'.chomp('d') # => "abc"
'abcdd'.chomp('d') # => "abcd"
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