Add .d as a valid source extension

[pepicrft]

Short description 📝

We were filtering out .d files from the list of sources.

Solution 📦

Change the validSourceExtensions value to include files with the .d extension.

Implementation 👩‍💻👨‍💻

• Update the value.
• Fix the tests.
• Update CHANGELOG.

cc @RomainBoulay

[tuistbot]

	1 Warning
⚠️	Have you introduced any user-facing changes? If so, please take some time to update the documentation. Keeping the documentation up to date makes it easier for users to learn how to use Tuist.

Generated by 🚫 Danger

[codecov]

Codecov Report

Merging #396 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #396   +/-   ##
=======================================
  Coverage   92.18%   92.18%           
=======================================
  Files         291      291           
  Lines       14615    14615           
=======================================
  Hits        13473    13473           
  Misses       1142     1142

Impacted Files	Coverage Δ
Sources/TuistGenerator/Models/Target.swift	95.52% <ø> (ø)	⬆️
Tests/TuistGeneratorTests/Models/TargetTests.swift	98.88% <100%> (ø)	⬆️

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[RomainBoulay]

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