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Use Module for configuring formatter instead of function ref (#114)


We've found that when attempting to build releases using Distillery, it barfs when trying to use a function ref as a config value.

This PR adds a behaviour so that anyone who wants to add a custom formatter module can do so safely.

8 of 8 new or added lines in 2 files covered. (100.0%)

144 of 151 relevant lines covered (95.36%)

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