erlang-erlware-commons source package infomation

- Remove from rebar3 bianry from source code.

  erlang-erlware-commons's original source codes contains rebar3 binary.
  The source package of Debian has deleted this binary.

 -- Nobuhiro Iwamatsu <iwamatsu@debian.org> Wed, 22 Nov 2017 12:28:53 +0900
