MATH-1537: Clean-up.

Closes #137, closes #138, closes #139.
diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index a951246..2d82bf0 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -54,6 +54,9 @@
     </release>
 
     <release version="4.0" date="XXXX-XX-XX" description="">
+      <action dev="erans" type="fix" issue="MATH-1537" due-to="Jin Xu">
+        Clean-up (typos and unused "import" statements).
+      </action>
       <action dev="erans" type="fix" issue="MATH-1531">
         "EmpiricalDistribution": Workaround to avoid spurious exception.
       </action>