Merge ~mthaddon/charm-k8s-ingress/+git/charm-k8s-ingress:readme-app-name into charm-k8s-ingress:master

[Tom Haddon]

Use application name rather than model name in example ingress relation

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Change successfully merged at revision 4db025ed9ceb6333e981816c6399c2b3315b0585

diff --git a/README.md b/README.md
index 25d9de4..d1dc427 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ def _on_ingress_changed(self, event: ops.framework.EventBase) -> None:
     """Handle the ingress relation changed event."""
     if self.unit.is_leader():
         event.relation.data[self.app]["service-hostname"] = self.config["external_hostname"]
-        event.relation.data[self.app]["service-name"] = self.model.name
+        event.relation.data[self.app]["service-name"] = self.app.name
         event.relation.data[self.app]["service-port"] = "80"
 ```
 All of the config items in `config.yaml` with the exception of `kube-config` can