Minor clean-up

[dkarrasch]

This also adds a Project.toml file to the test project as it seems to be the standard for Julia version v1.2+.

[codecov]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #170   +/-   ##
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  Coverage          ?   99.63%           
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  Files             ?       14           
  Lines             ?     1089           
  Branches          ?        0           
=========================================
  Hits              ?     1085           
  Misses            ?        4           
  Partials          ?        0           

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