Added dependency to the requests-cache module

Author: AmineI

addon.xml

@@ -3,6 +3,7 @@
     <requires>
         <import addon="xbmc.python" version="2.19.0" />
         <import addon="script.module.requests" version="2.18.4" />
+        <import addon="script.module.requests-cache" version="0.4.13" />
         <import addon="script.module.routing" version="0.2.0"/>
     </requires>
     <extension point="xbmc.python.pluginsource" library="addon.py">