Add draft 5.4.1 release notes

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+# CiviCRM 5.4.1
+
+Released **FIXME**
+
+- **[Synopsis](#synopsis)**
+- **[Bugs resolved](#bugs)**
+- **[Credits](#credits)**
+- **[Feedback](#feedback)**
+
+## <a name="synopsis"></a>Synopsis
+
+| *Does this version...?*                                         |         |
+|:--------------------------------------------------------------- |:-------:|
+| Fix security vulnerabilities?                                   |   no    |
+| Change the database schema?                                     |   no    |
+| Alter the API?                                                  |   no    |
+| Require attention to configuration options?                     |   no    |
+| Fix problems installing or upgrading to a previous version?     | **yes** |
+| Introduce features?                                             |   no    |
+| **Fix bugs?**                                                   | **yes** |
+
+## <a name="bugs"></a>Bugs resolved
+
+* **(dev/core#316) Fix crash on Memcache systems when session key involves whitespace ([12653](https://github.com/civicrm/civicrm-core/pull/12653))**
+* **(dev/core#304) Fix crash in upgrading option-group data on some Drupal/Views configurations ([12649](https://github.com/civicrm/civicrm-core/pull/12649))**
+
+## <a name="credits"></a>Credits
+
+This release was developed by the following authors and reviewers:
+
+Australian Greens - Seamus Lee; Chris Burgess; Christian Wach; Circle Interactive - Dave Jenkins; CiviCRM - Coleman
+Watts, Tim Otten; CompuCorp - René Olivo; Wikimedia Foundation - Eileen McNaughton
+
+## <a name="feedback"></a>Feedback
+
+These release notes are edited by Tim Otten and Andrew Hunt.  If you'd like to
+provide feedback on them, please login to https://chat.civicrm.org/civicrm and
+contact `@agh1`.