add note on versioning approach to changelog #903

Job	Run time
Resolve environment (ubuntu-latest, stable-v2.13.4)	35s
Resolve environment (macos-latest, stable-v2.13.4)	1m 27s
Resolve environment (windows-latest, stable-v2.13.4)	1m 57s
Resolve environment (ubuntu-latest, default)	45s
Resolve environment (macos-latest, default)	4m 2s
Resolve environment (windows-latest, default)	2m 29s
Resolve environment (ubuntu-latest, latest)	45s
Resolve environment (macos-latest, latest)	2m 19s
Resolve environment (windows-latest, latest)	1m 53s
Resolve environment (ubuntu-latest, nightly-latest)	47s
Resolve environment (macos-latest, nightly-latest)	3m 17s
Resolve environment (windows-latest, nightly-latest)	2m 19s
	22m 35s

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