add missing test dependency

[KristofferC]

No description provided.

[coveralls]

Coverage remained the same at 96.479% when pulling 5de75fb on KristofferC:master into 41d2278 on JuliaAlgebra:master.

[codecov-io]

Codecov Report

Merging #10 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #10   +/-   ##
=======================================
  Coverage   96.87%   96.87%           
=======================================
  Files           8        8           
  Lines         160      160           
=======================================
  Hits          155      155           
  Misses          5        5

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[blegat]

I have remove the REQUIRE file and the use of Compat in
08d6253