add a CHANGELOG.md file, which is easier to link to and process

CHANGELOG.md

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+# Changelog
+
+## Release 1.2.0
+
+* Support `--light`, `--quiet`, and `--logging LEVEL` arguments for less output
+  (#78, resolves #37)
+* Support the [markdownlint](https://github.com/markdownlint/markdownlint) tool
+  (#79, resolves #58)
+* Extract BaseRunner (#82) and RelevantRunner (#83) parent classes from the tool
+  runners, to allow new tools to be more easily implemented. (Resolves #81)
+* Extract a Cli::Presenter from the Entrypoint, to simplify pending work on cli
+  presentation (#84, resolves #42)
+* Update the docs a bit, and add a changelog (hi!)
+
+## Release 1.1.0
+
+* Support a `file_filter` config entry per-tool (without a cli option), to limit
+  what file paths a runner might supply to its tool based on a regex
+  (#74, resolves #68)
+* When what tools to execute is not specified (by cli or by config file), abort
+  `bin/qq` and explain, rather than assuming "all of them" (#79, resolves #58)
+* Update the config parser to handle keys named to match the cli options
+  alongside the ones that were (mistakenly) named differently. This is a
+  backwards-compatible change; if we eventually deprecate and simplify some of
+  these option names, you'll have plenty of warning (#77, resolves #75)
+* Support `--version/-V` flag (#73, resolves #69)
+
+## Release 1.0.3
+
+* Fix the printed _output_ for the case where there were some warnings from a
+  tool, but all of them were filtered out (because they targetted lines that
+  were not changed, for example). This situation should tell you that nothing
+  is wrong with your PR, not that there is a problem (#71)
+
+## Release 1.0.2
+
+* Fix the _exit status_ for the case where there were some warnings from a
+  tool, but all of them were filtered out (because they targetted lines that
+  were not changed, for example). This situation should produce a successful
+  result, and not fail a CI pipeline (#67)
+
+## Release 1.0.1
+
+* Fix the calculation of `changed_files` for the executor - in the migration
+  to Entrypoint, the actual git call to get a ChangedFiles object to pass into
+  other service classes was lost, which had the result that the entire system
+  behaved (outside of tests) as if you were always running with `--all-files`
+  (#65).
+
+## Release 1.0.0
+
+Initial functional public release.