use uint32 for --max-log-size

[sergiud]

Related to #497

[codecov-commenter]

Codecov Report

Merging #773 (588d298) into master (42d509b) will increase coverage by 1.97%.
The diff coverage is 78.94%.

@@            Coverage Diff             @@
##           master     #773      +/-   ##
==========================================
+ Coverage   72.62%   74.59%   +1.97%     
==========================================
  Files          17       17              
  Lines        3240     3791     +551     
==========================================
+ Hits         2353     2828     +475     
- Misses        887      963      +76     

Impacted Files	Coverage Δ
src/glog/logging.h.in	78.07% <ø> (-1.93%)	⬇️
src/logging.cc	77.15% <78.94%> (+3.82%)	⬆️

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