Fix CI badge, as we have switched from Travis to CircleCI
Fix CI badge, as we have switched from Travis to CircleCI

im-in-space/mastodon,glitch-soc/mastodon,im-in-space/mastodon,glitch-soc/mastodon,im-in-space/mastodon,Kirishima21/mastodon,Kirishima21/mastodon,Kirishima21/mastodon,Kirishima21/mastodon,glitch-soc/mastodon,glitch-soc/mastodon,im-in-space/mastodon