Fetch args, log spawn toggle

What's Changed

• Fix exit typo by piggynl in #4
• Adds support for git fetch arguments by FlickF in #5
• Update README.md by @dabreadman in #6
• Add toggle to log spawn by @dabreadman in #7

New Contributors

• piggynl made their first contribution in https://github.com/piggynl/sync-upstream-repo/commit/a4d2b3d4a4c794285f4886486fa1b6aa6d2454e8
• FlickF made their first contribution in urdhi@7dc1f99

Full Changelog: v0.1.2...v1.3.0