Update stackoverflow button to use https

Author: bfcoder

bfcoder-github-com/app/templates/application.hbs

@@ -29,8 +29,8 @@
   <footer class="mx-3">
     <!-- Stack Overflow -->
     <p>
-      <a href="http://stackoverflow.com/users/1477165/bfcoder">
-        <img src="http://stackoverflow.com/users/flair/1477165.png?theme=dark" width="208" height="58" alt="profile for bfcoder at Stack Overflow, Q&A for professional and enthusiast programmers" title="profile for bfcoder at Stack Overflow, Q&A for professional and enthusiast programmers">
+      <a href="https://stackoverflow.com/users/1477165/bfcoder">
+        <img src="https://stackoverflow.com/users/flair/1477165.png?theme=dark" width="208" height="58" alt="profile for bfcoder at Stack Overflow, Q&A for professional and enthusiast programmers" title="profile for bfcoder at Stack Overflow, Q&A for professional and enthusiast programmers">
       </a>
     </p>
     <!-- End Stack Overflow -->