examples: replace all app.Run(iris.Addr(...)) with app.Listen just for the shake of simplicity, both are doing the same exact thing as it's described on the http listening first example.

Former-commit-id: d20afb2e899aee658a8e0ed1693357798df93462

_examples/configuration/from-yaml-file/main.go

@@ -14,9 +14,9 @@ func main() {
 	// Good when you have two configurations, one for development and a different one for production use.
 	// If iris.YAML's input string argument is "~" then it loads the configuration from the home directory
 	// and can be shared between many iris instances.
-	app.Run(iris.Addr(":8080"), iris.WithConfiguration(iris.YAML("./configs/iris.yml")))
+	app.Listen(":8080", iris.WithConfiguration(iris.YAML("./configs/iris.yml")))
 
 	// or before run:
 	// app.Configure(iris.WithConfiguration(iris.YAML("./configs/iris.yml")))
-	// app.Run(iris.Addr(":8080"))
+	// app.Listen(":8080")
 }

_examples/configuration/from-yaml-file/shared-configuration/main.go

@@ -14,8 +14,8 @@ func main() {
 	// Good when you share configuration between multiple iris instances.
 	// This configuration file lives in your $HOME/iris.yml for unix hosts
 	// or %HOMEDRIVE%+%HOMEPATH%/iris.yml for windows hosts, and you can modify it.
-	app.Run(iris.Addr(":8080"), iris.WithGlobalConfiguration)
+	app.Listen(":8080", iris.WithGlobalConfiguration)
 	// or before run:
 	// app.Configure(iris.WithGlobalConfiguration)
-	// app.Run(iris.Addr(":8080"))
+	// app.Listen(":8080")
 }