link fix (#224)

Author: Anupam-dagar

index.html

@@ -254,7 +254,7 @@ <h4 align="center">Interested in sponsorsing Hack In The North?<br><br> Please s
                                                 <a href="https://www.python.org/psf/"><img class="last-year-spsr" src="static/sponsors/PSF.png" style="margin-top: 15%;"></a>
                                             </div>
                                             <div class="col-md-3">
-                                                    <a href="https://www.python.org/psf/"><img class="last-year-spsr" src="static/sponsors/Arkham.png"></a>
+                                                    <a href="http://arkhamseo.com/"><img class="last-year-spsr" src="static/sponsors/Arkham.png"></a>
                                             </div>
                                         </div>
                                         <div class="row">
@@ -296,7 +296,7 @@ <h4 align="center">Interested in sponsorsing Hack In The North?<br><br> Please s
                                                     <a href="https://www.sketchapp.com/"><img class="last-year-spsr" src="static/sponsors/sketch.svg" style="margin-top: 30%;"></a>
                                                 </div>
                                                 <div class="custom-small">
-                                                    <a href="https://www.sketchapp.com/"><img class="last-year-spsr" src="static/sponsors/restdblogo.png" style="margin-top: 28%;"></a>
+                                                    <a href="https://restdb.io/"><img class="last-year-spsr" src="static/sponsors/restdblogo.png" style="margin-top: 28%;"></a>
                                                 </div>
                                             </div>
                                             <div class="row">