chore(deps): update dependency @types/json-schema to v7

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "@types/apollo-codegen": "^0.16.0",
     "@types/graphql": "^0.13.1",
     "@types/jest": "^23.0.0",
-    "@types/json-schema": "^6.0.1",
+    "@types/json-schema": "^7.0.0",
     "@types/lodash": "^4.14.109",
     "@types/node": "^10.1.4",
     "@types/react-jsonschema-form": "^1.0.4",

yarn.lock

@@ -382,10 +382,15 @@
   version "23.0.0"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-23.0.0.tgz#760cac74f00bb9c3075587716d2b3b4435663bc0"
 
-"@types/json-schema@*", "@types/json-schema@^6.0.1":
+"@types/json-schema@*":
   version "6.0.1"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-6.0.1.tgz#a761975746f1c1b2579c62e3a4b5e88f986f7e2e"
 
+"@types/json-schema@^7.0.0":
+  version "7.0.15"
+  resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841"
+  integrity sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==
+
 "@types/lodash@^4.14.109":
   version "4.14.109"
   resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.109.tgz#b1c4442239730bf35cabaf493c772b18c045886d"