fix for formating precision loss (closes #12)

[eddelbuettel]

No description provided.

[codecov-io]

Codecov Report

Merging #13 into master will not impact coverage.

@@          Coverage Diff          @@
##           master    #13   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          57     59    +2     
=====================================
+ Hits           57     59    +2

Impacted Files	Coverage Δ
R/nanotime.R	100% <100%> (ø)	✅

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