Apply copier template

.copier-answers.yml

 # Changes here will be overwritten by Copier
-_commit: v0.1.6
+_commit: v0.2.0
 _src_path: https://gitlab.softwareheritage.org/swh/devel/swh-py-template.git
 description: Software Heritage Mercurial Loader
 distribution_name: swh-loader-mercurial
-have_cli: false
-have_workers: true
+have_cli: true
+have_workers: false
 package_root: swh/loader/mercurial
 project_name: swh.loader.mercurial
 python_minimal_version: '3.7'