update feed.xml, _layouts/post.html to use httpS

Author: cometsong

_layouts/post.html

@@ -1,11 +1,11 @@
 ---
 layout: default
 ---
-<article class="post" itemscope itemtype="http://schema.org/BlogPosting">
+<article class="post" itemscope itemtype="https://schema.org/BlogPosting">
 
   <header class="post-header">
     <h1 class="post-title" itemprop="name headline">{{ page.title }}</h1>
-    <p class="post-meta"><time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">{{ page.date | date: "%b %-d, %Y" }}</time>{% if page.author %} • <span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">{{ page.author }}</span></span>{% endif %}</p>
+    <p class="post-meta"><time datetime="{{ page.date | date_to_xmlschema }}" itemprop="datePublished">{{ page.date | date: "%b %-d, %Y" }}</time>{% if page.author %} • <span itemprop="author" itemscope itemtype="https://schema.org/Person"><span itemprop="name">{{ page.author }}</span></span>{% endif %}</p>
   </header>
 
   <div class="post-content" itemprop="articleBody">

feed.xml

@@ -2,7 +2,7 @@
 layout: null
 ---
 <?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+<rss version="2.0" xmlns:atom="https://www.w3.org/2005/Atom">
   <channel>
     <title>{{ site.title | xml_escape }}</title>
     <description>{{ site.description | xml_escape }}</description>