Output error log

[keigohtr]

What is this PR for?

Add error log output

This PR includes

• Add output error log

What type of PR is it?

Feature

What is the issue?

N/A

How should this be tested?

N/A

[codecov-io]

Codecov Report

Merging #42 into master will decrease coverage by 0.24%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   88.29%   88.05%   -0.25%     
==========================================
  Files          15       15              
  Lines         846      854       +8     
==========================================
+ Hits          747      752       +5     
- Misses         99      102       +3

Impacted Files	Coverage Δ
rekcurd/core/rekcurd_worker.py	76.28% <100%> (+0.75%)	⬆️
rekcurd/core/rekcurd_worker_servicer.py	87.11% <71.42%> (-1.5%)	⬇️

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[yuki-mt]

LGTM!