chore(deps): update dependency prettier-package-json to v2 (#70)

Author: renovate[bot]

package.json

@@ -46,7 +46,7 @@
     "jest-puppeteer": "3.2.1",
     "lint-staged": "7.2.0",
     "prettier": "1.14.2",
-    "prettier-package-json": "1.6.0",
+    "prettier-package-json": "2.0.0",
     "puppeteer": "1.7.0",
     "rimraf": "2.6.2",
     "rollup": "0.64.1",

yarn.lock

@@ -5441,9 +5441,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier-package-json@1.6.0:
-  version "1.6.0"
-  resolved "https://registry.yarnpkg.com/prettier-package-json/-/prettier-package-json-1.6.0.tgz#39ab6a4ddf806366bb70a26b6c6397d80a97c712"
+prettier-package-json@2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/prettier-package-json/-/prettier-package-json-2.0.0.tgz#b520a4a246a7c4814884f32934bc56b9139dbd14"
   dependencies:
     commander "^2.9.0"
     fs-extra "^3.0.1"