fix issue #118

[dehann]

fixes #118

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@faa525f). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #121   +/-   ##
=========================================
  Coverage          ?   66.51%           
=========================================
  Files             ?       14           
  Lines             ?     1735           
  Branches          ?        0           
=========================================
  Hits              ?     1154           
  Misses            ?      581           
  Partials          ?        0

Impacted Files	Coverage Δ
src/FactorGraph01.jl	56.68% <0%> (ø)

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