Update release notes for 0.19.1

docs/releases/v0.19.1.rst

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+CodeRed CMS 0.19.1 release notes
+================================
+
+
+Bug fixes
+---------
+
+* Search URL with invalid parameters would return 500 error. Now returns 200
+  with no search results instead.
+
+* Fix file upload fields in forms (pages based on ``CoderedFormMixin``).
+
+* Update sass file path in documentation.
+
+
+Thank you!
+----------
+
+Thanks to everyone who contributed to `0.19.1 on GitHub <https://github.com/coderedcorp/coderedcms/milestone/29?closed=1>`_.