announce 0.2.2 release

Sponsored-by: author

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+[[!tag announcement]]
+[[!meta date="2021-08-07 18:30:00 +0300"]]
+[[!meta title="Subplot 0.2.2 released—acceptance testing tool"]]
+
+[Subplot project]: https://subplot.liw.fi/
+[Subplot tool]: https://subplot.liw.fi/
+[home page]: https://subplot.liw.fi/
+[version control]: https://gitlab.com/subplot/subplot
+[installation]: https://subplot.liw.fi/download/
+
+The [Subplot project][] announces the 0.2.2 release of the [Subplot tool][]
+for documenting acceptance criteria and verifying them
+automatically.
+
+See [home page][], [version control][] repository, and [installation][]
+instructions.
+
+# Version 0.2.2, released 2021-08-07
+
+This is release is meant for use by people other than Subplot's own
+developers. It is of ALPHA quality, in that what is implemented is
+meant to work, but we reserve the right to make backwards incompatible,
+breaking changes in future releases.
+
+## General
+
+* When a scenario step matches more than one binding, the error
+  message now lists all the matching bindings to make it easier for
+  the user to fix the problem. (By Lars Wirzenius)
+
+* The documentation now explains core concepts relevant to Subplot,
+  and suggests an initial workflow for a project using Subplot. (By
+  Lars Wirzenius)
+
+## Python support
+
+* The `lib/daemon` Subplot library now uses custom Python code instead
+  of the netcat tool. This removes a dependency, and also avoids the
+  problem of there being at least two more or less incompatible
+  versions of netcat in common use. (By Alexander Batischev)
+
+* The `lib/daemon` library now has a way to pass environment variables
+  to the daemon. (By Alexander Batischev)
+
+## Bash support
+
+* The documentation now makes it clearer that the `files_get`
+  function returns the contents of the embedded file and not a
+  filename. (By Richard Maw)
+  
+* Some spelling and other language mistakes have been fixed in the
+  documentation for Bash support. (By Richard Maw)
+
+* The `dict` helper functions can now read embedded files. (By Richard
+  Maw)
+
+* The generated Bash test program now supports the `--env` option to
+  let the user pass in environment variables when invoking the test
+  program. (By Richard Maw)
+  
+* Assertion functions now return an error rather then terminating the
+  test program. This lets cleanups run. (By Richard Maw)