Update drone.yml

drone.yml

   commands:
     - export PATH=$PATH
     - echo 'Acquire::http { Proxy "http://unino.de:3142"; }' | tee -a /etc/apt/apt.conf.d/proxy
+    - ls -l /var/cache/apt/archives
     - apt-get update
     - apt-get --yes upgrade
     - apt-get --yes install build-essential libc6-dev libhidapi-dev libssl-dev