update README example

Author: qrkourier

README.md

@@ -10,8 +10,7 @@ This creates a demo network named "BibbidiBobbidiBoo" with your API account stor
 Learn about getting an API account by reading the [Authentication Guide](https://developer.netfoundry.io/v2/guides/authentication/)
 
 ```bash
-$ python3 -m netfoundry.demo BibbidiBobbidiBoo
-INFO: running demo script in /home/alice/.pyenv/versions/3.9.0/lib/python3.9/site-packages/netfoundry/demo.py
+python3 -m netfoundry.demo --network=BibbidiBobbidiBoo
 ```
 
 ## Create network snippet from demo.py
@@ -20,15 +19,15 @@ INFO: running demo script in /home/alice/.pyenv/versions/3.9.0/lib/python3.9/sit
 #!/usr/bin/env python3
 import netfoundry
 
-# default API account credential file is ~/.netfoundry/credentials.json
-Organization = netfoundry.Organization(credentials="credentials.json")
+# user-default path is ~/.netfoundry/
+organization = netfoundry.Organization(credentials="credentials.json")
 
 # use some Network Group, default is to use the first and there's typically only one
-network_group = netfoundry.NetworkGroup(Organization)
+network_group = netfoundry.NetworkGroup(organization)
 
 # create a Network
 network_name = "BibbidiBobbidiBoo"
-if network_name in network_group.networks_by_name.keys():
+if network_name in network_group.networks_by_name().keys():
     # use the Network
     network = netfoundry.Network(network_group, network_name=network_name)
     network.wait_for_status("PROVISIONED",wait=999,progress=True)