create changelog (closes #20)

Signed-off-by: Sven Schultschik <sven@schultschik.de>

changelog_jatex.xml

@@ -0,0 +1,20 @@
+<changelogs>
+    <changelog>
+        <element>jatex</element>
+        <type>plugin</type>
+        <version>2.0.0</version>
+        <fix>
+        </fix>
+        <addition>
+            <item>add changelog</item>
+        </addition>
+        <change>
+            <item>rework to J4 and J5 extension structure</item>
+        </change>
+        <remove>
+            <item>remove mimetek</item>
+        </remove>
+        <note>
+        </note>
+    </changelog>
+</changelogs>

src/plugins/jatex/jatex.xml

@@ -50,6 +50,7 @@
             </fieldset>
         </fields>
     </config>
+    <changelogurl>https://raw.githubusercontent.com/svanschu/Joomla-Tex-Tools/main/changelog_jatex.xml</changelogurl>
     <updateservers>
         <server type="extension" priority="2" name="JaTeX updates">https://github.com/svanschu/Joomla-Tex-Tools/raw/main/update_jatex.xml</server>
     </updateservers>