Fix test_staticarrays.jl

[tkf]

It looks like StaticArrays.jl v0.7.1 was released before merging #31 :)
https://github.com/JuliaArrays/StaticArrays.jl/releases/tag/v0.7.1

Probably that's why the PR tests were fine but the latest build failed.

[codecov-io]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #33   +/-   ##
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  Coverage          ?   96.09%           
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  Files             ?        4           
  Lines             ?      205           
  Branches          ?        0           
=========================================
  Hits              ?      197           
  Misses            ?        8           
  Partials          ?        0

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[jw3126]

Cool!