Update compose version 3 to 3.6.

With somewhat-recent docker features and spec changes that have been included in the compose file generation for this script, specifying compose file version 3.6 (at least) is necessary for the output compose file to pass validation using "docker-compose config".

Author: Red5d

autocompose.py

@@ -47,7 +47,7 @@ def render(struct, args, networks, volumes):
     if args.version == 1:
         pyaml.p(OrderedDict(struct))
     else:
-        ans = {'version': '"3"', 'services': struct}
+        ans = {'version': '"3.6"', 'services': struct}
 
         if networks is not None:
             ans['networks'] = networks