Add release notes

Author: TravisCardwell

project/release/redact-haskell-0.4.0.0.md

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+# `redact-haskell` `0.4.0.0` Release Notes
+
+Date
+: 2022-03-02
+
+## Overview
+
+Redact is a utility for hiding secret text on the terminal.
+
+See the [README][] for details.
+
+[README]: <https://github.com/ExtremaIS/redact-haskell#readme>
+
+## This Release
+
+This release of Redact is almost a complete rewrite.  It is now implemented in
+a way that allows for extensive testing using mocks.  The `redact`
+command-line utility also has significant changes.
+
+### `MonadTerminal`, `MonadHandle`, and Mock Tests
+
+The project was redesigned to use a library.  The API uses (`MonadTerminal`
+and `MonadHandle`) type classes instead of `IO` directly.  This allows much
+more of the implementation to be tested, using the [HMock][] library.
+
+[HMock]: <https://hackage.haskell.org/package/HMock>
+
+### `--lenient` Flag
+
+In this release of Redact, the program terminates if there is a parsing error.
+A `--lenient` flag is added, which causes the program to ignore parsing
+errors, like the behavior in previous versions.
+
+### Exception Handling
+
+If the program has an error, an exception handler now resets the terminal.
+This prevents the terminal from remaining in redact mode in cases when an
+error is raised while in redact mode.
+
+### Dependency Versions
+
+The following dependency version upper bound has been bumped to support the
+latest version.
+
+* [`optparse-applicative`](https://hackage.haskell.org/package/optparse-applicative)
+
+### Compatibility
+
+Redact is currently tested with [GHC 8.2.2][] through [GHC 9.2.1][].  The
+`.cabal` file uses Cabal version 1.24 (included with GHC 8.2.2), so it should
+build fine on relatively old Haskell installations as well as current
+installations.
+
+[GHC 8.2.2]: <https://www.haskell.org/ghc/download_ghc_8_2_2.html>
+[GHC 9.2.1]: <https://www.haskell.org/ghc/download_ghc_9_2_1.html>
+
+### Issues
+
+There are no known issues at this time.