Fix NPE when closing a stream from a different thread #167.

See also #166.
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index e30cbec..23a87a2 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -53,6 +53,9 @@
       <action type="fix" dev="ggregory" due-to="Boris Petrov">
         Fix closing the files cache after warning that not all components have been closed; #165.
       </action>
+      <action type="fix" dev="ggregory" due-to="Boris Petrov, Gary Gregory, Max Kellermann">
+        Fix NPE when closing a stream from a different thread #167. See also #166.
+      </action>
       <!-- UPDATES  -->
       <action type="update" dev="ggregory" due-to="Arturo Bernal">
         Replace construction of FileInputStream and FileOutputStream objects with Files NIO APIs. #164.