0.3.0

[AmrDeveloper]

• Implement Aggregation functions count, max, min, sum.
• Implement insertions, deletations, file changes for diffs table.
• Remove un needed dependencies Don't use git2 default features as they are not needed. #4.
• Publish the project on crates.io.
• Create docs website.
• Support Number expression.
• Support Arithmetics operators.
• Support Bitwise operators.
• Support selecting commit id

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This discussion was created from the release 0.3.0.