docs: Add missing 1.5.0 header to release notes #156

Job	Run time
General Pull Request Checks / Run Cargo Deny (bans licenses sources)	44s
General Pull Request Checks / Run Cargo Deny (advisories)	45s
General Pull Request Checks / Run Cargo Tests	3m 57s
General Pull Request Checks / Run Cargo Udeps	8m 36s
General Pull Request Checks / Run RustDoc	7m 19s
General Pull Request Checks / All tests passed	3s
	21m 24s

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