release-0.4.1

What's Changed

ymir-executor 0.4.1
[bugfix] save the best model with highest mAP, even if it's in the warmup process
[bugfix] monitor.txt now uses float as it's timestamp record
[bugfix] fix training dockerfile failure

• hotfix best map by @fenrir-z in #18
• fix training dockerfile failure by @fenrir-z in #19
• monitor.txt: timestamp uses float by @fenrir-z in #20

Full Changelog: release-0.4.0...release-0.4.1