v3.0.0

• improve performance (#1706)
• rewrite diff check algorithm (#1706)
• fix linter fixes (#1706)

In case you maintain a linter-ui packages (e.g. linter-ui-default, linter-minimap), see this guide for upgrading: https://github.com/steelbrain/linter/blob/master/docs/guides/upgrading-to-linter-v3.md