Java: Add change note for extensible security queries.

aschackmull · aschackmull · commit 1beb3bdccdea · 2020-10-29T15:37:35.000+01:00
This covers #3928, #3968, and #4172, among others.
diff --git a/java/change-notes/2020-08-31-extensible-security-queries.md b/java/change-notes/2020-08-31-extensible-security-queries.md
@@ -0,0 +1,4 @@
+lgtm,codescanning
+* Several security queries have been refactored to make them easier to extend with additional
+  sinks and/or taint steps. Sink definitions have generally been moved to importable libraries,
+  which can then be extended in `Customizations.qll`.
