fix: support oneline xml files

[mrexox]

:zap: Summary

matches? method returns false for XML files that have 1 line only. This PR fixes it.

:ballot_box_with_check: Checklist

• [x] Add specs

[coveralls-official[bot]]

Pull Request Test Coverage Report for Build 5044262641

• 4 of 4 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.613%

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Totals
Change from base Build 5043969340:	0.0%
Covered Lines:	724
Relevant Lines:	799

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💛 - Coveralls