Make custom enumerable "flattenable"

Simply just alias to_a to to_ary

class A
  include Enumerable

  def each
    yield "a"
    yield "b"
  end
end

Without an alias, enumerables are not exploded properly…

[A.new, A.new].flatten => [#<A:0x00007fbddf1b5d88>, #<A:0x00007fbddf1b5d60>]

class A
  def to_ary
    to_a
  end
end

…but with to_ary provided, they are :D

[A.new, A.new].flatten => ["a", "b", "a", "b"]

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