Cleans up trailing whitespace (#700)

_includes/comments.html

@@ -1,6 +1,6 @@
-{% if page.comments %}        
+{% if page.comments %}
   {% include disqus.html %}
   {% include fb-comment.html %}
   {% include staticman-comments.html %}
   {% include utterances-comment.html %}
-{% endif %}
+{% endif %}

_includes/header.html

@@ -36,7 +36,7 @@
       <h2 class="{{ include.type }}-subheading">{{ page.subtitle }}</h2>
       {% endif %}
       {% endif %}
-      
+
       {% if include.type == "post" %}
           <span class="post-meta">Posted on {{ page.date | date: date_format }}</span>
           {% if page.readtime %}
@@ -64,7 +64,7 @@
       <h2 class="{{ include.type }}-subheading">{{ page.subtitle }}</h2>
       {% endif %}
       {% endif %}
-      
+
       {% if include.type == "post" %}
           <span class="post-meta">Posted on {{ page.date | date: date_format }}</span>
           {% if page.readtime %}

_includes/social-networks-links.html

@@ -59,7 +59,7 @@
     </a>
   </li>
 {%- endif -%}
-  
+
 {%- if site.social-network-links.github -%}
   <li class="list-inline-item">
     <a href="https://github.com/{{ site.social-network-links.github }}" title="GitHub">

_includes/utterances-comment.html

@@ -4,7 +4,7 @@
         repo="{{ site.utterances.repository }}"
         issue-term="{{ site.utterances.issue-term }}"
         theme="{{ site.utterances.theme}}"
-        label="{{ site.utterances.label}}" 
+        label="{{ site.utterances.label}}"
         crossorigin="anonymous"
         async>
 </script>