Updated Installation (markdown)

Installation.md

@@ -17,26 +17,21 @@ If you don't want to recompile every time when you run your game, you can instal
 go install github.com/hajimehoshi/ebiten/...
 ```
 
-# Modules (Go 1.11 beta 2)
+# Modules (Go 1.11)
 
-As of Go 1.11, modules are introduced experimentally. You can work with Ebiten without GOPATH environment variable. If you want to use Ebiten with modules, execute these commands with Go 1.11 beta 2:
+As of Go 1.11, modules are introduced experimentally. You can work with Ebiten without GOPATH environment variable. If you want to use Ebiten with modules, execute these commands with Go 1.11:
 
-```
-# Create your workspace
-mkdir mygo
-cd mygo
-go1.11beta2 mod -init -module example.com/m
-#   The above module name is arbitrary.
-#   If you want to make this public on GitHub later,
-#   name it properly like github.com/yourname/yourgame.
-
-# Get the latest Ebiten (This is optional:
-# If you skip this, the latest stable version will be used.)
-go1.11beta2 get github.com/hajimehoshi/ebiten@master
-
-# Write your game
-editor main.go
-
-# Run your game
-go1.11beta2 run .
+```sh
+# Write your game at your favorite directory.
+cd yourgame
+# ...
+
+# Initialize go.mod by `go mod`.
+# Use URL for your package like `github.com/yourname/yourgame`.
+# If you are not sure and don't plan to share it so far, `example.com/m` is fine.
+go mod init example.com/m
+
+# Run your game.
+# `go run` installs related libraries automatically.
+go run .
 ```