Fix handling of URLs with semicolons

[macbre]

Resolves #280 // see reworkcss/css#137

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$ echo "@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;600&display=swap'); body {}" | DEBUG=* ./bin/analyze-css.js -
  analyze-css:bin analyze-css v0.13.0 +0ms
...
  analyze-css:parser Going to parse 0.10 kB of CSS +0ms
  analyze-css:parser CSS parsed +1ms
  analyze-css {"type":"import","import":"url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400","position":{"start":{"line":1,"column":1},"end":{"line":1,"column":75}}} +17ms
  analyze-css {"type":"rule","selectors":["600&display=swap'); body"],"declarations":[],"position":{"start":{"line":1,"column":75},"end":{"line":1,"column":102}}} +0ms
  analyze-css:bin Exiting with exit code #1 +21ms
Error: 600&display=swap'); body is an invalid expression

[coveralls]

Pull Request Test Coverage Report for Build 936294124

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 935680240:	0.0%
Covered Lines:	521
Relevant Lines:	521

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 936298801

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

---

Totals
Change from base Build 935680240:	0.0%
Covered Lines:	521
Relevant Lines:	521

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💛 - Coveralls