Single default branch or single named branch

[chfw]

delivers #172,

https://travis-ci.org/moremoban/moban/jobs/486801861 force R.Yaml to be updated from 0.15.86 -> 0.15.87

[chfw]

I expect other data structure would come here, i.e. target, at the moment, is a dictionary but will be evolved to be a class.

[codecov-io]

Codecov Report

Merging #210 into dev will decrease coverage by 0.02%.
The diff coverage is 97.95%.

@@            Coverage Diff             @@
##              dev     #210      +/-   ##
==========================================
- Coverage   98.45%   98.42%   -0.03%     
==========================================
  Files          44       45       +1     
  Lines        2132     2157      +25     
==========================================
+ Hits         2099     2123      +24     
- Misses         33       34       +1

Impacted Files	Coverage Δ
tests/test_utils.py	95.31% <100%> (+0.39%)	⬆️
tests/test_moban_file.py	100% <100%> (ø)	⬆️
moban/mobanfile.py	99.15% <100%> (-0.04%)	⬇️
moban/utils.py	97.58% <100%> (ø)	⬆️
moban/constants.py	100% <100%> (ø)	⬆️
moban/definitions.py	92.85% <92.85%> (ø)

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