chore: license date and revm docs

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Valgrind Results:

==4045== Cachegrind, a cache and branch-prediction profiler
==4045== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==4045== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==4045== Command: target/release/snailtracer
==4045== 
--4045-- warning: L3 cache found, using its data for the LL simulation.
Snailtracer Host+Interpreter benchmark (2.3s) ...            not enough samples
==4045== 
==4045== I   refs:      471,784,786
==4045== I1  misses:          3,450
==4045== LLi misses:          2,892
==4045== I1  miss rate:        0.00%
==4045== LLi miss rate:        0.00%
==4045== 
==4045== D   refs:      229,163,974  (152,345,766 rd   + 76,818,208 wr)
==4045== D1  misses:        322,765  (    182,958 rd   +    139,807 wr)
==4045== LLd misses:        137,527  (      4,054 rd   +    133,473 wr)
==4045== D1  miss rate:         0.1% (        0.1%     +        0.2%  )
==4045== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==4045== 
==4045== LL refs:           326,215  (    186,408 rd   +    139,807 wr)
==4045== LL misses:         140,419  (      6,946 rd   +    133,473 wr)
==4045== LL miss rate:          0.0% (        0.0%     +        0.2%  )