der

der: add changelog entry for v0.7.9 (#1377) #2786

Job	Run time
build (1.71.0, thumbv7em-none-eabi)	1m 38s
derive (1.71.0)	20s
build (1.71.0, wasm32-unknown-unknown)	1m 28s
derive (stable)	27s
build (stable, thumbv7em-none-eabi)	1m 22s
minimal-versions	0s
build (stable, wasm32-unknown-unknown)	1m 21s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.71.0, sudo apt update && sudo apt install gcc-mult...	10m 9s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	10m 1s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.71.0)	10m 30s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9m 42s
	46m 58s

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