chore(deps): update dependency ajv to v7 (#59)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package-lock.json

@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/conventional-changelog/conventional-changelog-config-spec#readme",
   "devDependencies": {
-    "ajv": "6.12.5",
+    "ajv": "7.0.3",
     "mocha": "8.1.3",
     "standard": "14.3.4",
     "standard-version": "9.1.0"