docs: add CHANGELOG.md

docs/CHANGELOG.md

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+## vab 0.4.2
+*01 October 2024*
+
+#### Notable changes
+
+Start using a change log.
+Added `vab.android.emulator` module for basic emulator control
+
+#### Commits
+
+platforms: minor format unification in `AndroidManifest.xml` (#291)
+options, deploy: fix setting `device_id` when `verbosity <= 1` (#293)
+vab, cli: refactor flag parsing, deprecate programmatic `flag.FlagParser` usage (#294)
+ci: update GitHub action versions to prevent warnings (#295)
+all: run `v fmt -w .` in project root (#296)
+vab, cli: minimize special handling of input in user space (#297)
+cli, options: simplify special case handling, pass unknown flags to caller/`opt.additional_args` (#298)
+cli, tests: fix `input_from_args`, fix cli tests (#299)
+vab: colored errors, warnings, notices, shorter `opt.verbosity` print statements (#300)
+cli, compile: support `-no-bounds-checking` v flag (#301)
+util: show job error when failing in `run_jobs` (#302)
+cli: fail better on V style flag parsing (#303)
+options: use `ANDROID_SERIAL` env variable as default `device_id` (#304)
+docs: add FAQ entry about examples (#306)
+all: run `v fmt -w .` in project root (is `vfmt` drunk?) (#305)
+ci: remove obsolete cancel job, use concurrency group names from V CI (#307)
+env: add preliminary emulator support (#308)
+tests: add + support runtime tests (#309)
+ci, emulator: use `actions/checkout` to install V and examples in one go (#310)
+ci, tests: ignore `notice:` in error tests more gracefully (#311)
+ci: use faster `aosp_atd` avd variant instead of `google_apis` in legacy emulator (#312)
+ci: use `ubuntu-latest` on steps: `code-formatting`, `v-compiles-os-android` (#313)
+deploy: trigger `logcat -c` *after* package installs, increase sleeps a bit (#314)
+env, ci: add support for linux emulator runs, add new `emulator` module (#315)