refactor Log for smaller precisions (#167)

name                                  old time/op  new time/op  delta
Calculate/A.json-8    42.7ms ± 0%   4.0ms ± 0%  -90.63%  (p=0.000 n=9+8)
Calculate/B.json-8    14.3ms ± 0%  10.9ms ± 0%  -23.55%  (p=0.000 n=10+10)
Calculate/C.json-8     418ms ± 0%   331ms ± 0%  -20.86%  (p=0.000 n=9+10)
Calculate/D.json-8     546ms ± 0%    97ms ± 0%  -82.20%  (p=0.000 n=10+10)
Calculate/E.json-8     2.30s ± 0%   0.99s ± 0%  -56.87%  (p=0.000 n=9+9)
Calculate/F.json-8     1.92s ± 0%   0.28s ± 0%  -85.21%  (p=0.000 n=9+9)
Calculate/G.json-8    22.6µs ± 0%  22.2µs ± 0%   -2.05%  (p=0.000 n=10+10)
Calculate/H.json-8     127ms ± 0%    50ms ± 0%  -60.92%  (p=0.000 n=8+10)
Calculate/I.json-8     3.39s ± 0%   0.58s ± 0%  -82.85%  (p=0.000 n=9+10)
Calculate/J.json-8    1.18ms ± 0%  1.25ms ± 0%   +6.06%  (p=0.000 n=10+9)
Calculate/K.json-8     159ms ± 0%   127ms ± 0%  -20.15%  (p=0.000 n=10+10)
Calculate/L.json-8    76.3ms ± 0%  37.3ms ± 0%  -51.14%  (p=0.000 n=9+10)

Thanks to Ziglu (ziglu.io) for sponsoring the development work.

Signed-off-by: Eric Lagergren <[email protected]>