update credits links (#600)

Author: Arhell

credits.html

@@ -7,7 +7,7 @@
   <h1>Credits</h1>
 
   <p>
-    Project started by <strong><a href="http://twitter.com/davert">Michael Bodnarchuk "Davert"</a></strong>.
+    Project started by <strong><a href="https://twitter.com/davert">Michael Bodnarchuk "Davert"</a></strong>.
   </p>
 
   <h3>Codeception Team</h3>
@@ -49,15 +49,15 @@ <h3>Thanks to all our contributors</h3>
   <h3>Support</h3>
 
   <ul>
-<!--    <li>start a thread at <a href="http://phptest.club/category/codeception">PHP Test Club</a> forum</li>-->
-    <li>ask your question in <a href="http://gitter.im/Codeception/Codeception">Gitter</a> chat</li>
+<!--    <li>start a thread at <a href="https://phptest.club/category/codeception">PHP Test Club</a> forum</li>-->
+    <li>ask your question in <a href="https://gitter.im/Codeception/Codeception">Gitter</a> chat</li>
     <li>create an issue on <a href="https://github.com/codeception/codeception/issues">GitHub</a>.</li>
     <li>create quest on StackOverflow (and send link to IRC chat, that will speed up things).</li>
     <li>join converstion on <strong>#codeception</strong> channel on FreeNode IRC.</li>
   </ul>
 
   <h3>Consulting</h3>
 
-  <p>Official <a href="http://sdclabs.com/codeception">consulting services provided by SDCLabs</a></p>
+  <p>Official <a href="https://sdclabs.com/codeception">consulting services provided by SDCLabs</a></p>
 
 </div>