removed a dot on donation sentence

Author: andreareginato

index.html

@@ -815,7 +815,7 @@ <h1 id="thanks">Thanks</h1>
       </p>
 
       <p>
-      If you like what I'm doing offer me a coffe.
+      If you like what I'm doing offer me a coffe
 <script data-gittip-username="andreareginato"
         data-gittip-widget="button"
         src="//gttp.co/v1.js"></script>