[erlang-patches] Add supervisor:start_child/3 to limit the number of children

[Tuncer Ayaz]

> On Thu, Jan 15, 2015 at 8:30 PM, Siri Hansen wrote:
> I'm happy to announce that in OTP-18, the supervisor API will be
> improved to allow supervisor flags and childspecs declared as maps
> (similar to
> http://erlang.org/pipermail/erlang-patches/2012-January/002574.html,
> except maps are used instead of proplists). This will allow for
> additions to these data structures.

To be totally clear, it will be optional and require 18.x, but
existing code will still work, right?