fix missing colon

Signed-off-by: scicco <zendar79@gmail.com>

Author: scicco

scompose/project/instance.py

@@ -236,7 +236,7 @@ def _get_network_commands(self, ip_address=None, network_type=None):
         for arg in network_args:
             ports += ["--network-args", arg]
 
-        if network_type is not None
+        if network_type is not None:
             # network_type is "bridge" by default when network.enable is True
             ports += ["--network", network_type]