[ruby-cvs:78288] 91bf3b7a77 (master): Use singleline/multiline instead of readline/reidline

aycabta	2019-10-30 09:32:16 +0900 (Wed, 30 Oct 2019)

  New Revision: 91bf3b7a77

  https://github.com/ruby/ruby/commit/91bf3b7a77

  Log:
    Use singleline/multiline instead of readline/reidline

  Modified files:
    doc/irb/irb.rd.ja
    lib/irb.rb
    lib/irb/context.rb
    lib/irb/init.rb
    lib/irb/lc/help-message
    lib/irb/lc/ja/help-message
    man/irb.1
    test/irb/test_context.rb