Add 0.7.9 to changelog

8 jobs for master in 9 minutes and 36 seconds (queued for 13 minutes and 10 seconds)
Status Job ID Name Coverage
  Build
passed #21407
build:nightly:gpu_cache

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passed #21409
build:no_std

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passed #21408
build:redox

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passed #21405
build:stable

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passed #21406
build:stable:gpu_cache

00:01:34

 
  Test
passed #21412
test:dev

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passed #21410
test:stable

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passed #21411
test:stable:gpu_cache

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