chore(deps): bump level from 5.0.1 to 6.0.1 (#31)

Bumps [level](https://github.com/Level/level) from 5.0.1 to 6.0.1.
- [Release notes](https://github.com/Level/level/releases)
- [Changelog](https://github.com/Level/level/blob/master/CHANGELOG.md)
- [Commits](Level/level@v5.0.1...v6.0.1)

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

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

BREAKING CHANGE: requires an upgrade to existing datastores created in the browser with level-js@4 or below

package.json

@@ -44,7 +44,7 @@
   "dependencies": {
     "datastore-core": "^3.0.0",
     "interface-datastore": "^3.0.3",
-    "level": "^5.0.1"
+    "level": "^6.0.1"
   },
   "devDependencies": {
     "aegir": "^30.3.0",