added support for v3.1-RC

[Alessandro100]

Fixes https://github.com/MobilityData/gbfs-validator/issues/184

Added support for GBFS v3.1-RC

New custom rules added

• [system_pricing_plans] reservation_price_per_min or reservation_price_flat_rate allowed in plans
• [vehicle_types] if reservation_price_per_min or reservation_price_flat_rate is present in the associated vehicle type, then default_reserve_time becomes required

Key changed files gbfs-validator/versions/partials/v3.1-RC/vehicle_types/default_reserve_time_require.js gbfs-validator/gbfs.js

Key test files gbfs-validator/test/fixtures/conditional_default_reserve_time.js gbfs-validator/test/gbfs.test.js

References https://gbfs.org/specification/ https://github.com/MobilityData/gbfs/blob/v3.1-RC/gbfs.md

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