Testing sample data has been taken of from core.

component/admin/packages/master_core380.xml

@@ -311,8 +311,6 @@
     <filename>plg_quickicon_phpversioncheck.sys.ini</filename>
     <filename>plg_sampledata_blog.ini</filename>
     <filename>plg_sampledata_blog.sys.ini</filename>
-    <filename>plg_sampledata_testing.ini</filename>
-    <filename>plg_sampledata_testing.sys.ini</filename>
     <filename>plg_search_categories.ini</filename>
     <filename>plg_search_categories.sys.ini</filename>
     <filename>plg_search_contacts.ini</filename>

localise.xml

@@ -8,7 +8,7 @@
 	<copyright>(C) 2017 Open Source Matters. All rights reserved.</copyright>
 	<authorEmail>[email protected]</authorEmail>
 	<authorUrl>https://github.com/joomla-projects/com_localise</authorUrl>
-	<version>4.0.30-dev</version>
+	<version>4.0.31-dev</version>
 	<license>http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL</license>
 	<description>COM_LOCALISE_XML_DESCRIPTION</description>
 	<scriptfile>install.php</scriptfile>

media/com_localise/packages/core.xml

@@ -219,8 +219,6 @@
 		<filename>plg_quickicon_phpversioncheck.sys</filename>
 		<filename>plg_sampledata_blog</filename>
 		<filename>plg_sampledata_blog.sys</filename>
-		<filename>plg_sampledata_testing</filename>
-		<filename>plg_sampledata_testing.sys</filename>
 		<filename>plg_search_categories</filename>
 		<filename>plg_search_categories.sys</filename>
 		<filename>plg_search_contacts</filename>

update-server.xml

@@ -5,10 +5,10 @@
 		<description>Localise - nice and easy management of languages and translation files.</description>
 		<element>com_localise</element>
 		<type>component</type>
-		<version>4.0.30-dev</version>
+		<version>4.0.31-dev</version>
 		<infourl title="com_localise">https://github.com/joomla-projects/com_localise/</infourl>
 		<downloads>
-			<downloadurl type="full" format="zip">https://github.com/joomla-projects/com_localise/releases/download/4.0.30-dev/com_localise-4.0.30-dev.zip</downloadurl>
+			<downloadurl type="full" format="zip">https://github.com/joomla-projects/com_localise/releases/download/4.0.31-dev/com_localise-4.0.31-dev.zip</downloadurl>
 		</downloads>
 		<targetplatform name="joomla" version=".*" />
 	</update>