[INTERNAL] README.md: Adjust migration note to highlight Version 4

SAP / ui5-tooling

An open and modular toolchain to develop state of the art applications based on the UI5 framework

https://sap.github.io/ui5-tooling

Apache License 2.0

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Closed flovogt closed 2 months ago

flovogt commented 2 months ago

UI5 Tooling Version 4 is released for some weeks, so consumers should migrate to Version 4 instead of Version 3