Update footer.html (#86)

docs:update copyright year

Author: linpan

_includes/footer.html

@@ -1,7 +1,7 @@
 <footer class="hyper-footer col-md-12">
     <div class="container">
         <div class="row">
-            <div class="col-sm-6 text-center text-sm-left text-muted">&copy; 2022 hyper</div>
+            <div class="col-sm-6 text-center text-sm-left text-muted">&copy; 2023 hyper</div>
             <div class="col-sm-6 text-center text-sm-right">
                 <a href="https://github.com/hyperium/hyperium.github.io/blob/master/{{ page.path }}">
                     edit this page on github