update

Dockerfile

@@ -10,13 +10,13 @@ RUN echo '{"app_name":"Go Playground","no_reconfig":true \
 ,"files":[{"path":"main.go","name":"Main","action":"go run main.go","order":-1},{"path":"shell.sh","name":"Shell","action":"bash shell.sh","order":1}] \
 ,"hide_config":true}' > conf.json
 
-RUN echo 'package main \
-\
-import "fmt" \
-\
-func main() { \
-	fmt.Println("Hello, world.") \
-}' > main.go
+RUN echo 'package main\n\
+\n\
+import "fmt"\n\
+\n\
+func main() {\n\
+	fmt.Println("Hello, world.")\n\
+}\n' > main.go