Update thunderbird.html

projects/thunderbird.html

@@ -18,13 +18,13 @@ title: Thunderbird Style Guide and Usability Study
     <div class="large-8 columns">
       <img src="../images/projects/thunderbird_logo.png" alt="">
       <div class="spacing"></div>
-      <img src="../images/projects/thunderbird_1.png" alt="">
+      <img src="../images/projects/thunderbird_4.png" alt="">
       <div class="two spacing"></div>
       <img src="../images/projects/thunderbird_2.png" alt="">
       <div class="spacing"></div>
       <img src="../images/projects/thunderbird_3.png" alt="">
       <div class="spacing"></div>
-      <img src="../images/projects/thunderbird_4.png" alt="">
+      <img src="../images/projects/thunderbird_1.png" alt="">
       <div class="spacing"></div>
     </div>
     <div class="large-4 columns">