message: change tag to is in _app.js
diff: @@ -24,13 +24,13 @@ export default function Page({render}) {
  </Text>
  }
  >
  - <UnderlineNavLink tag={NavLink} to="/components" px={3}>
  + <UnderlineNavLink is={NavLink} to="/components" px={3}>
  Components
  </UnderlineNavLink>
  - <UnderlineNavLink tag={NavLink} to="/demos" px={3}>
  + <UnderlineNavLink is={NavLink} to="/demos" px={3}>
  Demos
  </UnderlineNavLink>
  - <UnderlineNavLink tag={NavLink} to="/sandbox" px={3}>
  + <UnderlineNavLink is={NavLink} to="/sandbox" px={3}>
  Sandbox
  </UnderlineNavLink>
  </UnderlineNav>
  