bumped the version and the changelog

Mergin/metadata.txt

@@ -4,14 +4,16 @@ name=Mergin
 qgisMinimumVersion=3.4
 qgisMaximumVersion=3.99
 description=Handle Mergin projects
-version=2020.2
+version=2020.3
 author=Lutra Consulting
 [email protected]
 about=Mergin is a repository for storing and tracking changes to QGIS projects/data. It is linked with Input(a QGIS mobile app). With this plugin, users can upload and sync their data to Mergin service.
 ; end of mandatory metadata
 
 ; start of optional metadata
-changelog=2020.2
+changelog=2020.3
+  - Resolve issue with sync in QGIS 3.10
+  <p>2020.2
   - Improve download/upload
   - Support for change of schema
   - Better error reporting