Fix isapprox problem introduced in 0.2.0

[ajkeller34]

No description provided.

[codecov-io]

Codecov Report

Merging #74 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #74      +/-   ##
=========================================
+ Coverage   68.94%   69.1%   +0.15%     
=========================================
  Files          12      12              
  Lines         834     835       +1     
=========================================
+ Hits          575     577       +2     
+ Misses        259     258       -1

Impacted Files	Coverage Δ
src/Unitful.jl	81.41% <100%> (+0.31%)	⬆️

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[coveralls]

Coverage decreased (-0.7%) to 68.263% when pulling 1b3d7c5 on isapprox into 94006dd on master.