Generalize `chained-comparison` (#2655)

`chained-comparison` detects boolean expressions such as `a < b and b < c` and suggests
it should be rewritten as `a < b < c`.

The current implementation is limited in two ways. First, cannot deal with existing chain
comparisons, so it would not detect the following:
    `a < b < c and c < d` # should be a < b < c < d

Second, the algorithm for detecting possible chains is simplistic, and would falsely
detect the following:

    `a < b < c and b < d` # no simplification possible

This change fixes both of these issues.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index e6b0ffe1f..d4ed3616c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -70,6 +70,11 @@ Release date: TBA
 
   Close #2565
 
+* Generalize ``chained-comparison``
+
+  Previous version incorrectly detects `a < b < c and b < d` and fails to
+  detect `a < b < c and c < d`.
+
 What's New in Pylint 2.2.2?
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