Fix typo.

index.html

@@ -176,7 +176,7 @@ <h2 class="title is-3">Dataset</h2>
             different colors and sizes. All trees were imaged from both the
             sunny and shady sides of the tree row and imaging was done over
             multiple days to account for variations in weather and lighting
-            conditions. The imaged trees consist of over 50 different varieties
+            conditions. The imaged trees consist of over 60 different varieties
             of citrus. All images include a timestamp, tree ID, and the side of
             the tree imaged in the file name.
           </p>