Add Symfony 7 support and drop 4 and 5

What's Changed

• Clean deps and upgrade to Symfony 7 by @Prometee in #5

Full Changelog: v2.0.1...v3.0.0

Add Symfony 6 support

What's Changed

• Update README.md by @YellowPhoenix18 in #3

New Contributors

• @YellowPhoenix18 made their first contribution in #3

Full Changelog: v2.0.0...v2.0.1

v2.0.0

Add refund, authorized flow and cancel to both gateways

v2.0.0-RC.1

Prepare 2.0 with refund, authorized flow and cancel

v1.2.1

Add Stripe JS gateway

v1.2.0

• BC BREAK: This bundle has been renamed from
  PayumStripeCheckoutSessionBundle to PayumStripeBundle
  to handle more than one gateway from Stripe.
• BC BREAK: Rename the namespace (vendor and plugin name) from
  Prometee\PayumStripeCheckoutSessionBundle to FluxSE\PayumStripeBundle
• BC BREAK: Rename the service name from
  prometee.payum_stripe_checkout_session.* to flux_se.payum_stripe.*

See FLUX-SE/PayumStripe#6 for more informations.

v1.1.0

Change version to highlight base library name change

v1.0.1

Fix composer issues add ecs and PHPUnit basic tests

v1.0.0

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