v3.0.3: Merge pull request #302 from petegallagher/whitelist-gitleaks.toml

What's new
Added some new rule defaults: gitleaks#296 gitleaks#295
Default config ignores gitleaks.toml files as those will trigger false positive leaks: gitleaks#302
Running gitleaks on staged, uncommitted changes will now honor the --repo-config flag and use more sensible default commit values rather than using the previous commit for leak values (for things like email, commit hash, date, etc). gitleaks#301