simplify loader initialization

[Herringway]

No description provided.

[codecov]

Codecov Report

Merging #320 (e361e50) into master (a0d7705) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #320      +/-   ##
==========================================
- Coverage   95.35%   95.34%   -0.01%     
==========================================
  Files          29       29              
  Lines        4496     4494       -2     
==========================================
- Hits         4287     4285       -2     
  Misses        209      209              

Files Changed	Coverage Δ
source/dyaml/reader.d	98.47% <ø> (ø)
source/dyaml/composer.d	96.74% <100.00%> (+0.05%)	⬆️
source/dyaml/loader.d	94.28% <100.00%> (-0.39%)	⬇️
source/dyaml/parser.d	98.76% <100.00%> (+<0.01%)	⬆️
source/dyaml/scanner.d	99.65% <100.00%> (ø)
source/dyaml/test/common.d	90.38% <100.00%> (ø)
source/dyaml/test/reader.d	75.00% <100.00%> (ø)
source/dyaml/test/tokens.d	100.00% <100.00%> (ø)

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