composer setup does not work on php5.6

[simon]

using docker run -it php:5.6.32 /bin/bash and the following commands:

apt-get update && apt-get install -y unzip git
git clone https://[e-mail]/simon_massey/thinbus-php.git
cd thinbus-php
curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
composer install
vendor/bin/phpunit ThinbusTestQuick.php

I get 15 errors like:

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for phpdocumentor/reflection-docblock 4.2.0 -> satisfiable by phpdocumentor/reflection-docblock[4.2.0].
    - phpdocumentor/reflection-docblock 4.2.0 requires php ^7.0 -> your PHP version (5.6.32) does not satisfy that requirement.
  Problem 2
    - Installation request for phpunit/php-code-coverage 5.3.0 -> satisfiable by phpunit/php-code-coverage[5.3.0].
    - phpunit/php-code-coverage 5.3.0 requires php ^7.0 -> your PHP version (5.6.32) does not satisfy that requirement.
  Problem 3
    - Installation request for phpunit/php-token-stream 2.0.2 -> satisfiable by phpunit/php-token-stream[2.0.2].
    - phpunit/php-token-stream 2.0.2 requires php ^7.0 -> your PHP version (5.6.32) does not satisfy that requirement.
  Problem 4
    - Installation request for phpunit/phpunit 6.5.4 -> satisfiable by phpunit/phpunit[6.5.4].
    - phpunit/phpunit 6.5.4 requires php ^7.0 -> your PHP version (5.6.32) does not satisfy that requirement.

[simon]

Have created a tar and instructions for php5.6 so as to not have to fix this on php5.6 as active support stopped 9 days ago and it will stop getting security fixes after 2018 so people who are concerned with security need to get off it now.