convert tab to spaces.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -423,6 +423,7 @@ Change MySQL Database Name:
 ```yml
     environment:
         MYSQL_DATABASE: laradock
+    ...
 ```
 
 Change Redis defaut port to 1111:
@@ -430,6 +431,7 @@ Change Redis defaut port to 1111:
 ```yml
     ports:
         - "1111:6379"
+    ...
 ```
 
 
@@ -548,6 +550,7 @@ Since the new Laravel application is in the `my-cool-app` folder, we need to rep
         build: ./application
         volumes:
             - ../my-cool-app/:/var/www/laravel
+    ...
 ```
 4 - Go to that folder and start working..
 
@@ -824,11 +827,12 @@ By default **PHP-FPM 7.0** is running.
 
 3 - Change the version number, by replacing `Dockerfile-70` with `Dockerfile-56`, like this:
 
-```txt
-php-fpm:
+```yml
+    php-fpm:
         build:
             context: ./php-fpm
             dockerfile: Dockerfile-70
+    ...
 ```
 
 4 - Finally rebuild the container