add code coverage; varargs fix

[ppalmes]

• issue add code coverage #19 and add varargs convenience function #20

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@cc985a6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #21   +/-   ##
=========================================
  Coverage          ?   50.42%           
=========================================
  Files             ?       13           
  Lines             ?      833           
  Branches          ?        0           
=========================================
  Hits              ?      420           
  Misses            ?      413           
  Partials          ?        0

Impacted Files	Coverage Δ
src/pipelines.jl	97.33% <ø> (ø)
src/ensemble.jl	84.29% <ø> (ø)

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