Bump level from 6.0.1 to 7.0.0

Bumps [level](https://github.com/Level/level) from 6.0.1 to 7.0.0.
- [Release notes](https://github.com/Level/level/releases)
- [Changelog](https://github.com/Level/level/blob/master/CHANGELOG.md)
- [Commits](Level/level@v6.0.1...v7.0.0)

---
updated-dependencies:
- dependency-name: level
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -9,7 +9,7 @@
     "test": "npm run build"
   },
   "dependencies": {
-    "level": "~6.0.0"
+    "level": "~7.0.0"
   },
   "devDependencies": {
     "browserify": "^16.2.3"