bump: v32 tag, main changelog

[rakita]

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Valgrind Results:

==3926== Cachegrind, a cache and branch-prediction profiler
==3926== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3926== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3926== Command: target/release/snailtracer
==3926== 
--3926-- warning: L3 cache found, using its data for the LL simulation.
Snailtracer Host+Interpreter benchmark (2.1s) ...            not enough samples
==3926== 
==3926== I   refs:      463,580,292
==3926== I1  misses:          3,506
==3926== LLi misses:          2,976
==3926== I1  miss rate:        0.00%
==3926== LLi miss rate:        0.00%
==3926== 
==3926== D   refs:      237,187,865  (160,465,027 rd   + 76,722,838 wr)
==3926== D1  misses:        324,587  (    184,726 rd   +    139,861 wr)
==3926== LLd misses:        137,567  (      4,063 rd   +    133,504 wr)
==3926== D1  miss rate:         0.1% (        0.1%     +        0.2%  )
==3926== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3926== 
==3926== LL refs:           328,093  (    188,232 rd   +    139,861 wr)
==3926== LL misses:         140,543  (      7,039 rd   +    133,504 wr)
==3926== LL miss rate:          0.0% (        0.0%     +        0.2%  )