Remove loading mark even task fails.
Remove unused import.
Organise imports.
Workaround libearth 0.3.0 incompatibility
Reformat changelog  [ci skip]
Require libearth 0.2.0 or later
Merge branch '0.1-maintenance' into 0.2-maintenance

Conflicts:
	setup.py
Release 0.2.1
Merge branch '0.2-maintenance'

Conflicts:
	earthreader/web/app.py
	earthreader/web/version.py