v0.1.0

This is the first release for the exporter! 🚀 🎉

This release add the flowing metrics :

• mastodon_accounts_number
• mastodon_statuses_count
• mastodon_domain_count
• mastodon_week_statuses_count
• mastodon_week_logins_count
• mastodon_week_registrations_count
• mastodon_month_active_count
• mastodon_half_year_active_count