Add change note.

Author: markshannon

change-notes/1.20/analysis-python.md

@@ -30,6 +30,7 @@ The API has been improved to declutter the global namespace and improve discover
 | Comparison using is when operands support \_\_eq\_\_ (`py/comparison-using-is`) | Fewer false positive results | Results where one of the objects being compared is an enum member are no longer reported. |
 | Modification of parameter with default (`py/modification-of-default-value`) | More true positive results | Instances where the mutable default value is mutated inside other functions are now also reported. |
 | Mutation of descriptor in \_\_get\_\_ or \_\_set\_\_ method (`py/mutable-descriptor`) | Fewer false positive results | Results where the mutation does not occur when calling one of the  `__get__`, `__set__` or `__delete__` methods are no longer reported. |
+| Redundant comparison (`py/redundant-comparison`) | Fewer false positive results | Results in chained comparisons are no longer reported. |
 | Unused import (`py/unused-import`) | Fewer false positive results | Results where the imported module is used in a `doctest` string are no longer reported. |
 | Unused import (`py/unused-import`) | Fewer false positive results | Results where the imported module is used in a type-hint comment are no longer reported. |