fix: don't panic at an unexpected log type

[Vladimir-Rom]

sometimes docker returns logType = 3 which is an undocumented log type, so treat it as stdout

fix #359

[codecov]

Codecov Report

Merging #360 (7184053) into master (31fb76b) will decrease coverage by 0.26%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
- Coverage   62.12%   61.85%   -0.27%     
==========================================
  Files          15       15              
  Lines         998     1012      +14     
==========================================
+ Hits          620      626       +6     
- Misses        283      289       +6     
- Partials       95       97       +2     

Impacted Files	Coverage Δ
docker.go	64.58% <0.00%> (-0.66%)	⬇️
container.go	85.29% <0.00%> (ø)

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[mdelapenya]

Hey @Vladimir-Rom thanks for this contribution. It seems OK to me although, as as you said, it could be difficult to reproduce it.

Nevertheless, I'm not blocking it, so LGTM 👍