Update release date

Author: gkarsay

NEWS

@@ -1,11 +1,10 @@
-Overview of Changes in Parlatype LibreOffice Extension 3.1 – 2021-12-XX
-=======================================================================
+Overview of Changes in Parlatype LibreOffice Extension 3.1.1 – 2021-12-19
+=========================================================================
 
 * New: Switched to Weblate for translations
 * New: Added first unit/integration tests
 * Fix: Don’t crash/freeze on WIN32 (regression introduced in 3.0)
 * New or updated languages:
-  - xx:    TODO UPDATE ON RELEASE DAY
   - de:    Gabor Karsay
   - nb_NO: Allan Nordhøy
   - pl:    Piotr Drąg

appdata/org.parlatype.LibreOfficeExtension.metainfo.xml.in

@@ -12,7 +12,7 @@
 	<url type="donation">https://www.parlatype.org/donate.html</url>
 
 	<releases>
-		<release version="3.1" date="2021-12-XX">
+		<release version="3.1.1" date="2021-12-19">
 			<description>
 			<p>This release is for Parlatype 3.1.</p>
 			<ul>