Add release notes

Author: TravisCardwell

project/release/queue-sheet-haskell-0.3.0.0.md

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+# `queue-sheet-haskell` `0.3.0.0` Release Notes
+
+Date
+: 2020-08-23
+
+## Overview
+
+This release of Queue Sheet introduces a number of new features:
+
+* Queues not explicitly associated with a section are implicitly associated
+  with a default section.  This provides a convenient way to create queue
+  sheets without sections.  One can specify the queue list as a top-level
+  array to simplify queue files in this case.
+
+* Queues from other queue files can be imported, either inheriting sections
+  or overriding them.  This allows users to easily create a custom queue sheet
+  that includes queues defined in separate files.
+
+* User-defined tags can now be associated with queues.  They can be handled in
+  any way that the user wants in the template.
+
+See the updated man page and examples for details.
+
+## Migration
+
+This release includes a number of breaking changes, in both queue files and
+templates.  Any existing files must be migrated to use the new version.
+
+### Queue Files
+
+The `split` property of queues is removed.  Use a `split` tag instead.
+
+### Templates
+
+Tags are now exposed in templates with a `tag_` prefix.  When using a
+`complete` tag, `isComplete` should be changed to `tag_complete` in templates.
+When using a `partial` tag, `isPartial` should be changed to `tag_partial` in
+templates.  When using a `split` tag, `isSplit` should be changed to
+`tag_split` in templates.
+
+For consistency, all template properties now use snake case.  `prevItem`
+should be changed to `prev_item`, and `nextItems` should be changed to
+`next_items` in templates.