Bump @reach/visually-hidden from 0.7.3 to 0.15.2 (#265)

Bumps [@reach/visually-hidden](https://github.com/reach/reach-ui/tree/HEAD/packages/visually-hidden) from 0.7.3 to 0.15.2.
- [Release notes](https://github.com/reach/reach-ui/releases)
- [Commits](https://github.com/reach/reach-ui/commits/v0.15.2/packages/visually-hidden)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -12,7 +12,7 @@
     "@reach/dialog": "^0.7.0",
     "@reach/skip-nav": "^0.7.3",
     "@reach/tabs": "^0.1.6",
-    "@reach/visually-hidden": "^0.7.3",
+    "@reach/visually-hidden": "^0.15.2",
     "flow": "^0.2.3",
     "flow-bin": "^0.115.0",
     "gatsby": "^2.18.22",