Add Perl dev testimonial

server/server.py

@@ -57,7 +57,7 @@ def isEven(number):
             return res
     except:
         res = jsonify(dict(
-            error='Invalid number.',
+            error='what is this I don\'t even',
         ))
         res.status_code = 400
         return res

website/index.html

@@ -401,6 +401,18 @@ $ curl https://api.isevenapi.xyz/api/iseven/6/
                                 </div> <!-- end of swiper-slide -->
                                 <!-- end of slide -->
 
+                                <!-- Slide -->
+                                <div class="swiper-slide">
+                                    <div class="image-wrapper">
+                                        <img class="img-fluid" src="images/testimonial-5.jpg" alt="alternative">
+                                    </div> <!-- end of image-wrapper -->
+                                    <div class="text-wrapper">
+                                        <div class="testimonial-text">I usually hate using APIs and trying new things. I prefer to keep all dependencies to a minimum. But when my friend on IRC mentioned isEven API, I just had to test it out. And I'm glad I did!</div>
+                                        <div class="testimonial-author">Dusty Anderson - Perl Developer</div>
+                                    </div> <!-- end of text-wrapper -->
+                                </div> <!-- end of swiper-slide -->
+                                <!-- end of slide -->
+
                                 <!-- Slide -->
                                 <div class="swiper-slide">
                                     <div class="image-wrapper">