Explain how to get 'Init You, Init Me' working in 2.13.2 or newer

See scala/scala#8748
scalapuzzlers · Aug 18, 2020 · 3c3226f · 3c3226f
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diff --git a/puzzlers/pzzlr-010.html b/puzzlers/pzzlr-010.html
@@ -20,6 +20,8 @@ <h1>Init You, Init Me</h1>
 <div class="code-snippet">
 <h3>What is the result of executing the following code?</h3>
 <pre class="prettyprint lang-scala">
+// start a 2.13.2 or newer REPL using "scala -Yrepl-class-based:false"
+// see https://github.com/scala/scala/pull/8748
 object XY {
   object X {
     val value: Int = Y.value + 1