fix missing filename in token tests

[Herringway]

No description provided.

[codecov]

Codecov Report

Merging #313 (c682037) into master (9456888) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #313   +/-   ##
=======================================
  Coverage   95.20%   95.20%           
=======================================
  Files          29       29           
  Lines        4569     4569           
=======================================
  Hits         4350     4350           
  Misses        219      219           

Impacted Files	Coverage Δ
source/dyaml/test/tokens.d	100.00% <100.00%> (ø)

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