Added missing extension annotation

[fo-code]

I added a missing extension annotation to the class GitDeltaCalculatorFactory.

[codecov]

Codecov Report

Merging #439 (3cdf480) into master (fbae6a9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #439   +/-   ##
=========================================
  Coverage     81.94%   81.94%           
  Complexity      194      194           
=========================================
  Files            26       26           
  Lines           781      781           
  Branches         82       82           
=========================================
  Hits            640      640           
  Misses          110      110           
  Partials         31       31           

Impacted Files	Coverage Δ
...forensics/git/delta/GitDeltaCalculatorFactory.java	100.00% <ø> (ø)

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