Fix the template in release-drafter.yml (#1057)

Author: nakamura-to

.github/release-drafter.yml

@@ -5,7 +5,7 @@ template: |
 
   $CHANGES
   
-  **Full Changelog**: https://github.com/$OWNER/$REPOSITORY/compare/$PREVIOUS_TAG...v$RESOLVED_VERSION
+  **Full Changelog**: https://github.com/$OWNER/$REPOSITORY/compare/$PREVIOUS_TAG...$RESOLVED_VERSION
 
 categories:
   - title: 'New Features'