Fixing year errata (it said 2017, not 2018)

Author: datapythonista

pandas/index.html

@@ -64,7 +64,7 @@
     <header id="site-header" class="site-header valign-center"> 
         <div class="intro">
 
-            <h2>10 March, 2017</h2>
+            <h2>10 March, 2018</h2>
 
             <h1 style="font-size: 48px;">Pandas documentation sprint</h1>