Fix typo in reference file loader help text

mutalyzer/templates/gbupload.html

@@ -64,7 +64,7 @@
               <b>Note:</b> This uses
               the <a href="http://www.ncbi.nlm.nih.gov/sites/gquery">NCBI
               Entrez</a> search engine and is therefore based on the current
-              Entrez assembly for the given organism (GRCh38/hg18 for human).
+              Entrez assembly for the given organism (GRCh38/hg38 for human).
             	<table>
              		<tr>
                   <td>Gene symbol</td>