Update drone.yml

drone.yml

     BUILDDEPS: build-essential libc6-dev libhidapi-dev libssl-dev   
     MAKEFLAGS: -j 4
   commands:
-    - cat >> /etc/apt/apt.conf.d/01-proxy <<-EOF
+    - | cat >> /etc/apt/apt.conf.d/01-proxy <<-EOF
         Acquire::http  { Proxy "http://172.17.0.1:3142"; }
         Acquire::https { Proxy "https://"; };
       EOF