Use SEQUENCE_REFERENCE when opening files in CheckFingerprints.

[yfarjoun]

Description

This should allow fingerprinting CRAM files directly.

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Checklist (never delete this)

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Content

• Added or modified tests to cover changes and any new functionality
• Edited the README / documentation (if applicable)
• All tests passing on Travis

Review

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• Rebase, squash and reword as applicable

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…s should allow fingerprinting CRAM files directly.

[coveralls]

Coverage remained the same at 71.055% when pulling d61a12b on yf_small_change_to_fingerprinting into 943c769 on master.

[nh13]

👍