Bump version to 3.0.0b1

[sdispater]

Added

• Made instance() support all native types (date, time, datetime). #732

Changed

• Dropped support for Python 3.7. #734
• Rewrote extensions in Rust. #721
• Made day of week convention more consistent across the codebase. #731

Fixed

• Fixed datetime string representation to match the native library. #733
• Fixed issues on some system when retrieving the local timezone. #733
• Fixed DST handling in start_of()/end_of() methods. #713

[codspeed-hq]

CodSpeed Performance Report

Merging #756 will improve performances by 24.31%

_{Comparing release/3.0.0b1 (1194e7b) with master (5c01d00)}

Summary

⚡ 1 improvements
✅ 1 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	release/3.0.0b1	Change
⚡	test_format	2.8 ms	2.3 ms	+24.31%