Update CHANGES.txt to include the description of #7210 (#7212)

protocolbuffers · Feb 14, 2020 · e9e4c68 · e9e4c68
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diff --git a/CHANGES.txt b/CHANGES.txt
@@ -2,6 +2,7 @@
 
   C#
   * Fix latest ArgumentException for C# extensions (#7188)
+  * Enforce recursion depth checking for unknown fields (#7210)
 
   Ruby
   * Fix wrappers with a zero value (#7195)