Fallback on churn.yml.dist

[villfa]

Closes #335

[codecov]

Codecov Report

Merging #338 (946fc78) into master (3b5f9d3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #338   +/-   ##
=========================================
  Coverage     98.96%   98.97%           
  Complexity        2        2           
=========================================
  Files            55       55           
  Lines           868      874    +6     
=========================================
+ Hits            859      865    +6     
  Misses            9        9           

Impacted Files	Coverage Δ
src/Configuration/Loader.php	100.00% <100.00%> (ø)

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