Update CHANGELOG for v0.1.12 release #309

Job	Run time
CI matrix / Assert PR branch is ahead	7s
Makefile / Assert PR branch is ahead	4s
Makefile / Build codebase using Makefile quick recipe	1m 5s
Makefile / Build codebase using Makefile all recipe	0s
Makefile / Lint codebase using Makefile	0s
CI matrix / Evaluate loopvar scoping changes	22s
CI matrix / Lint codebase (go-ci-oldstable, false)	36s
CI matrix / Run tests (go-ci-oldstable, false)	33s
CI matrix / Build codebase (go-ci-oldstable, false)	38s
CI matrix / Lint codebase (go-ci-stable, false)	39s
CI matrix / Run tests (go-ci-stable, false)	31s
CI matrix / Build codebase (go-ci-stable, false)	37s
CI matrix / Lint codebase (go-ci-unstable, true)	34s
CI matrix / Run tests (go-ci-unstable, true)	41s
CI matrix / Build codebase (go-ci-unstable, true)	24s
CI matrix / Optional Linting / Assert PR branch is ahead	6s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-oldstable, true)	43s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	46s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	1m 5s
	9m 31s

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