Fixes config issue with non-date strings

[bmitch]

No description provided.

[codecov]

Codecov Report

Merging #100 into master will increase coverage by 0.44%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #100      +/-   ##
============================================
+ Coverage     75.77%   76.22%   +0.44%     
+ Complexity       89       88       -1     
============================================
  Files            11       11              
  Lines           289      286       -3     
============================================
- Hits            219      218       -1     
+ Misses           70       68       -2

Impacted Files	Coverage Δ	Complexity Δ
src/Configuration/Config.php	100% <ø> (+3.57%)	23 <0> (-1)	⬇️

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