chore(deps): update dependency ajv to v6.8.1 (#427)

Author: renovate[bot]

packages/graphqlgen-json-schema/package.json

@@ -14,7 +14,7 @@
   },
   "devDependencies": {
     "@types/jest": "23.3.13",
-    "ajv": "6.7.0",
+    "ajv": "6.8.1",
     "jest": "23.6.0",
     "js-yaml": "3.12.1",
     "ts-jest": "23.10.5",

yarn.lock

@@ -292,9 +292,9 @@ acorn@^6.0.1:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.0.2.tgz#6a459041c320ab17592c6317abbfdf4bbaa98ca4"
 
-ajv@6.7.0:
-  version "6.7.0"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.7.0.tgz#e3ce7bb372d6577bb1839f1dfdfcbf5ad2948d96"
+ajv@6.8.1:
+  version "6.8.1"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.8.1.tgz#0890b93742985ebf8973cd365c5b23920ce3cb20"
   dependencies:
     fast-deep-equal "^2.0.1"
     fast-json-stable-stringify "^2.0.0"