[CRAN] Compatibility change for incoming {units} v0.8

[hongyuanjia]

Pull request overview

• Fixes Issues with the upcoming release of units 0.8-0 #499

[codecov]

Codecov Report

Merging #500 (9eeff6f) into master (656eced) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #500      +/-   ##
==========================================
+ Coverage   91.66%   91.72%   +0.06%     
==========================================
  Files          36       35       -1     
  Lines       14243    14228      -15     
==========================================
- Hits        13056    13051       -5     
+ Misses       1187     1177      -10     

Impacted Files	Coverage Δ
R/units.R

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