Bump version to 0.3.0

[kwridan]

• Ran make update_version after updating the version in the Makefile

Test Plan:

• Verify CI checks pass

[codecov]

Codecov Report

Merging #48 into master will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   96.05%   95.93%   -0.13%     
==========================================
  Files          42       42              
  Lines        1878     1450     -428     
==========================================
- Hits         1804     1391     -413     
+ Misses         74       59      -15     

Impacted Files	Coverage Δ
Sources/XCDiffCommand/Constants.swift	94.44% <100.00%> (-0.80%)	⬇️
...Core/Comparator/LinkedDependenciesComparator.swift	91.83% <0.00%> (-2.20%)	⬇️
...ultRenderer/JSONProjectCompareResultRenderer.swift	92.30% <0.00%> (-1.45%)	⬇️
Sources/XCDiffCommand/CommandRunner.swift	95.06% <0.00%> (-0.76%)	⬇️
...es/XCDiffCore/Comparator/CopyFilesComparator.swift	99.10% <0.00%> (-0.17%)	⬇️
...ces/XCDiffCore/Comparator/SettingsComparator.swift	95.65% <0.00%> (-0.08%)	⬇️
Sources/XCDiff/main.swift	0.00% <0.00%> (ø)
Sources/XCDiffCommand/Utils.swift	0.00% <0.00%> (ø)
Sources/XCDiffCore/Library/Diff.swift	100.00% <0.00%> (ø)
... and 33 more

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