Update related posts

_posts/2013-12-23-ruby-json.markdown

@@ -2,7 +2,7 @@
 layout: post
 title:  "Parsing JSON with Ruby"
 date:   2013-12-23 00:18:23 +0700
-categories: ruby
+categories: [ruby]
 ---
 Parsing JSON with Ruby is actually extremely easy. All you have to do is have the json gem installed (`gem install json`) and call the `JSON.parse` method on the JSON data to convert it to ruby hashes. If you look at this small program here, you can see how I have implemented parsing JSON in Ruby.
 

_posts/2013-12-23-welcome-to-simply-grey.markdown

@@ -2,7 +2,7 @@
 layout: post
 title:  "Welcome to Simply Grey"
 date:   2013-12-23 00:18:23 +0700
-categories: simplygrey
+categories: [simplygrey]
 ---
 SimplyGrey is a simple, easy to use theme for Jekyll that compromises of mainly grey colours. A lot of people enjoy the simplistic look of grey and also find it easier to read.
 

_posts/2016-04-19-email-backend-with-smtp-gmail.markdown

@@ -2,7 +2,7 @@
 layout: post
 title:  "Email BackEnd with SMTP Gmail"
 date:   2016-04-19 02:28:15 +0700
-categories: django
+categories: [python, django]
 ---
 Add this configurations in your `settings.py`
 

_posts/2016-04-19-remove-all-files-pyc-with-recrusive-method.markdown

@@ -2,7 +2,7 @@
 layout: post
 title:  "Remove all files .pyc with recrusive method"
 date:   2016-04-19 14:39:34 +0700
-categories: python bash
+categories: [python, bash]
 ---
 
 This method simple but important. Example in your project dir is like this:

_posts/2016-04-19-welcome-to-jekyll.markdown

@@ -2,7 +2,7 @@
 layout: post
 title:  "Welcome to Jekyll!"
 date:   2013-02-19 21:28:15 +0700
-categories: jekyll update
+categories: [jekyll, update]
 ---
 You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.