remove Loader.parse()

[Herringway]

Same as #318. Not generally useful.

[codecov]

Codecov Report

Merging #319 (4580a29) into master (2774ce1) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   95.29%   95.28%   -0.01%     
==========================================
  Files          29       29              
  Lines        4505     4499       -6     
==========================================
- Hits         4293     4287       -6     
  Misses        212      212              

Files Changed	Coverage Δ
source/dyaml/loader.d	91.02% <ø> (-0.12%)	⬇️
source/dyaml/test/common.d	90.38% <100.00%> (+0.80%)	⬆️
source/dyaml/test/compare.d	100.00% <100.00%> (ø)
source/dyaml/test/emitter.d	100.00% <100.00%> (ø)

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