fix git spr edit - don't git add -A

[ejoffe]

commit-id:9e28be53

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Stack:

• fix git spr edit - don't git add -A #508 ⬅
• new readme #507
• add ability to configure requiredChecks #506
• exclude non required checks from github checks status #505
• add --text (-t) to git spr status #504

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⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.