Explain while file creation failed

[benmccann]

Hopefully this can be committed even though it adds one line of uncovered code. I'm not quite sure how I'd trigger a file creation error for the tests and am not sure I'd want to spend time doing that

[codecov]

Codecov Report

Merging #126 into master will increase coverage by 0.00%.
The diff coverage is 25.00%.

@@            Coverage Diff            @@
##             master     #126   +/-   ##
=========================================
  Coverage     90.86%   90.87%           
  Complexity      401      401           
=========================================
  Files            49       49           
  Lines           974      975    +1     
  Branches        127      126    -1     
=========================================
+ Hits            885      886    +1     
- Misses           58       59    +1     
+ Partials         31       30    -1     

Impacted Files	Coverage Δ	Complexity Δ
...odegen/model/UnableToCreateDirectoryException.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/com/kobylynskyi/graphql/codegen/utils/Utils.java	80.48% <33.33%> (+0.48%)	20.00 <0.00> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 112feba...8f24f90. Read the comment docs.