fix typo

Author: arpitnarechania

index.html

@@ -261,7 +261,7 @@ <h6 class="text-secondary text-bold">Arpit Narechania, Alex Endert, Clio Andris<
                                 <li>CK-Means</li>
                                 <li>Head Tail Breaks</li>
                                 <li>Fisher-Jenks</li>
-                                <li>Exponential Bin ize</li>
+                                <li>Exponential Bin Size</li>
                                 <li>Geometric Interval</li>
                                 <li>Unclassed</li>
                                 <li>Unique</li>