Apply latest rekcurd

[keigohtr]

What is this PR for?

Update to the latest rekcurd spec.

This PR includes

• Renew rekcurd-client initializer
• Update to the latest rekcurd spec
• Update test

What type of PR is it?

Feature

What is the issue?

N/A

How should this be tested?

$ python -m unittest

[codecov-io]

Codecov Report

Merging #21 into master will decrease coverage by 1.01%.
The diff coverage is 76.19%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
- Coverage    94.8%   93.79%   -1.02%     
==========================================
  Files           6        6              
  Lines         289      290       +1     
==========================================
- Hits          274      272       -2     
- Misses         15       18       +3

Impacted Files	Coverage Δ
rekcurd_client/logger/__init__.py	100% <ø> (ø)	⬆️
rekcurd_client/core/rekcurd_worker_client.py	93.77% <76.19%> (-1.39%)	⬇️

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[yuki-mt]

need to change How to Use section in README and sample.py as well.
(and I don't think sample.py is necessary because How to Use section in README has the same code and the section describe the sample better)

[keigohtr]

@yuki-mt Thank you for your review.
I have added a new repository here for an example, and have deleted sample.py, and have updated README.md.
Could you review this again please?

[yuki-mt]

LGTM!