Add Upgrade guide

getsentry · Oct 17, 2023 · 64fe4b0 · 64fe4b0
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+# Upgrade 3.x to 4.0
+
+- The `send_attempts` option was removed. You may implement a custom transport if you rely on this behaviour.
+- `SpanContext::fromTraceparent()` was removed. Use `Sentry\continueTrace()` instead.
+- `TransactionContext::fromSentryTrace()` was removed. Use `Sentry\continueTrace()` instead.
+- The `IgnoreErrorsIntegration` integration was removed. Use the `ignore_errors` option instead.
+- `Sentry\Exception\InvalidArgumentException` was removed. Use `\InvalidArgumentException` instead.
+- `Sentry\Exception/ExceptionInterface` was removed.