Fold new items into 0.4.3.3-alpha changelog.

changes/ticket32672

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-  o Minor features (directory authorities):
-    - Directory authorities now reject descriptors from relays running Tor
-      versions from the 0.2.9 and 0.4.0 series, but still allow the 0.3.5
-      series. Resolves ticket 32672. Patch by Neel Chauhan.

changes/ticket32792

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-  o Testing:
-    - When a Travis chutney job fails, use chutney's new "diagnostics.sh" tool
-      to produce detailed diagnostic output. Closes ticket 32792.

changes/ticket33619

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-  o Major bugfixes (circuit padding, memory leaks):
-    - Avoid a remotely triggered memory leak in the case that a circuit
-      padding machine is somehow negotiated twice on the same circuit. Fixes
-      bug 33619; bugfix on 0.4.0.1-alpha.  Found by Tobias Pulls.  This is
-      also tracked as TROVE-2020-004.

changes/trove_2020_003

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-  o Minor bugfixes (onion services v3):
-  - Fix assertion failure that could result from a corrupted ADD_ONION control
-    port command. Found by Saibato. Fixes bug 33137; bugfix on
-    0.3.3.1-alpha. This issue is also being tracked as TROVE-2020-003.