fix issue #258

[Herringway]

All whitespace (except for the required indentation) should be ignored in flow context.
Fixes #258.

[codecov]

Codecov Report

Merging #262 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files          28       28           
  Lines        4126     4131    +5     
=======================================
+ Hits         3919     3924    +5     
  Misses        207      207           

Impacted Files	Coverage Δ
source/dyaml/loader.d	90.27% <100.00%> (+0.42%)	⬆️
source/dyaml/scanner.d	99.48% <100.00%> (+<0.01%)	⬆️

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[Herringway]

Indentation currently isn't properly respected (intentionally???) in flow contexts. But that's another thing to fix at another time.