chore: Bump to 0.5.0 for release

[CPerezz]

Bumping up a new release for halo2curves.

CHANGELOG:

What's Changed

• Add field conversion to/from [u64;4] by @jonathanpwang in Add field conversion to/from [u64;4] #80
• Compute Legendre symbol for hash_to_curve by @davidnevadoc in Compute Legendre symbol for hash_to_curve #77
• Add simplified SWU method by @davidnevadoc in Add simplified SWU method #81
• Bring back curve algorithms for a = 0 by @han0110 in Bring back curve algorithms for a = 0 #82
• fix: Improve serialization for prime fields by @huitseeker in fix: Improve serialization for prime fields #85
• refactor: (De)Serialization of points using GroupEncoding by @huitseeker in refactor: (De)Serialization of points using GroupEncoding #88
• Insert MSM and FFT code and their benchmarks. by @einar-taiko in Insert MSM and FFT code and their benchmarks. #86
• Re-export also mod pairing and remove flag reexport to alwasy re-export by @han0110 in Re-export also mod pairing and remove flag reexport to alwasy re-export #93
• fix regression in Re-export also mod pairing and remove flag reexport to alwasy re-export #93 reexport field benches aren't run by @mratsim in fix regression in #93 reexport field benches aren't run #94
• Fast modular inverse - 9.4x acceleration by @mratsim in Fast modular inverse - 9.4x acceleration #83
• Fast isSquare / Legendre symbol / Jacobi symbol - 16.8x acceleration by @mratsim in Fast isSquare / Legendre symbol / Jacobi symbol - 16.8x acceleration #95
• [fix/optimization] mul_by_3b special case should be CURVE_ID == "bn256_g1" by @jonathanpwang in [fix/optimization] mul_by_3b special case should be CURVE_ID == "bn256_g1" #101
• Fix nits in bn256. by @davidnevadoc in Fix nits in bn256. #99
• Legendre trait now uses accelerated Jacobi by @mratsim in Legendre trait now uses accelerated Jacobi #102
• Booth encoding by @kilic in Booth encoding #106
• Add Pluto-Eris cycle of curves by @davidnevadoc in Add Pluto-Eris cycle of curves #98
• chore(src): typo fix by @Pan-chao in chore(src): typo fix #111
• Fix asm version of from_512 by @davidnevadoc in Fix asm version of from_512 #108
• Update MSRV by @davidnevadoc in Update MSRV #113

[CPerezz]

cc: @huitseeker @srinathsetty

[davidnevadoc]

Thanks for taking care of this! LGTM