Improve collection of orphaned coroutines when yielding from debug hook functions.

README.html

@@ -977,6 +977,7 @@ Files are no longer hosted at LuaForge.
 <li>Fix return value for table.remove() and table.insert() (fixes issue #39)</li>
 <li>Fix aliasing issue for some multiple assignments from varargs return values (fixes issue #38)</li>
 <li>Let os.getenv() return System.getenv() values first for JSE, then fall back to properties (fixes issue #25)</li>
+<li>Improve collection of orphaned coroutines when yielding from debug hook functions.</li>
 
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