Update RendererDecorator.php
Update RendererDecorator.php

The Decorator MUST implement the RenderableInterface contract.
leonampd/DesignPatternsPHP,leonampd/DesignPatternsPHP,zoka123/DesignPatternsPHP,ModernPUG/DesignPatternsPHP,leonampd/DesignPatternsPHP,HossamYoussef2009/DesignPatternsPHP,ModernPUG/DesignPatternsPHP,piotrgradzinski/DesignPatternsPHP,domnikl/DesignPatternsPHP,andreustimm/DesignPatternsPHP,andreustimm/DesignPatternsPHP,piotrgradzinski/DesignPatternsPHP,piotrgradzinski/DesignPatternsPHP,HossamYoussef2009/DesignPatternsPHP,ModernPUG/DesignPatternsPHP,HossamYoussef2009/DesignPatternsPHP,domnikl/DesignPatternsPHP