Throw error when multiple versions specified #249

Job	Run time
Test with default inputs (4.11.1, ubuntu-latest)	12s
Test with dest (4.11.1, ubuntu-latest)	9s
Test with default inputs (4.11.1, macos-latest)	25s
Test with standalone (ubuntu-latest, true)	13s
Test with dest (4.11.1, macos-latest)	34s
Test with default inputs (4.11.1, windows-latest)	37s
Test with standalone (ubuntu-latest, false)	8s
Test with dest (4.11.1, windows-latest)	45s
Test with run_install (null, ubuntu-latest)	9s
Test with standalone (macos-latest, true)	42s
Test with run_install (empty object, ubuntu-latest)	11s
Test with standalone (macos-latest, false)	21s
Test with run_install (recursive, ubuntu-latest)	11s
Test with standalone (windows-latest, true)	33s
Test with run_install (global, ubuntu-latest)	14s
Test with standalone (windows-latest, false)	25s
Test with run_install (array, ubuntu-latest)	18s
Test with run_install (null, macos-latest)	27s
Test with run_install (empty object, macos-latest)	21s
Test with run_install (recursive, macos-latest)	29s
Test with run_install (global, macos-latest)	26s
Test with run_install (array, macos-latest)	42s
Test with run_install (null, windows-latest)	36s
Test with run_install (empty object, windows-latest)	36s
Test with run_install (recursive, windows-latest)	42s
Test with run_install (global, windows-latest)	47s
Test with run_install (array, windows-latest)	49s
	12m 2s

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