Update README with working --host= example

Author: adammck

README.md

@@ -80,7 +80,7 @@ It's just a Go app, so the usual:
 To test against an example statefile, run:
 
 	terraform-inventory --list fixtures/example.tfstate
-	terraform-inventory --host=web-aws fixtures/example.tfstate
+	terraform-inventory --host=52.7.58.202 fixtures/example.tfstate
 
 To update the fixtures, populate `fixtures/secrets.tfvars` with your DO and AWS
 account details, and run `fixtures/update`. You almost certainly don't need to