Update index.html

Author: sbonaretti

index.html

@@ -240,7 +240,7 @@ <h2>About the Book</h2>
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-            <center>Next upload: <b>Chapters 35 and 36</b> on <b>May 21</b> </center>
+            <center>Next upload: <b>Chapters 35 and 36</b> on <b>June 18</b> </center>
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