Merge pull request #1227 from plotly/scala-https

link scala thumbnail from https not http

Author: michaelbabyn

_includes/lang-navigation.html

@@ -104,7 +104,7 @@
 		{%- if page.permalink contains {{page_type}} and page.language == "scala" -%}
 			<li class="lang-nav--item">
                 <a class="lang_nav_button {{scalaclass}}" href="/scala{{page_type}}">
-					<div><img src="http://images.plot.ly/plotly-documentation/thumbnail/scala-small.jpg" alt="scala" class="lang_nav_thum"></div>
+					<div><img src="https://images.plot.ly/plotly-documentation/thumbnail/scala-small.jpg" alt="scala" class="lang_nav_thum"></div>
 					Scala
                 </a>
             </li>