Sort config keys

Signed-off-by: Daniel Nephin <[email protected]>

compose/config.py

@@ -12,9 +12,9 @@ from compose.cli.utils import find_candidates_in_parent_dirs
 DOCKER_CONFIG_KEYS = [
     'cap_add',
     'cap_drop',
+    'command',
     'cpu_shares',
     'cpuset',
-    'command',
     'detach',
     'devices',
     'dns',
@@ -28,12 +28,12 @@ DOCKER_CONFIG_KEYS = [
     'image',
     'labels',
     'links',
+    'log_driver',
+    'log_opt',
     'mac_address',
     'mem_limit',
     'memswap_limit',
     'net',
-    'log_driver',
-    'log_opt',
     'pid',
     'ports',
     'privileged',