Bump prettier from 1.16.1 to 1.16.4 (#1729) [ci skip]

Bumps [prettier](https://github.com/prettier/prettier) from 1.16.1 to 1.16.4.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@1.16.1...1.16.4)

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

package.json

@@ -81,7 +81,7 @@
     "lint-staged": "^8.1.0",
     "preact-render-spy": "^1.3.0",
     "preact-render-to-json": "^3.6.6",
-    "prettier": "^1.16.1",
+    "prettier": "^1.16.4",
     "webpack-dev-server": "^2.11.3"
   },
   "dependencies": {

yarn.lock

@@ -8472,10 +8472,10 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prettier@^1.16.1:
-  version "1.16.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.16.1.tgz#534c2c9d7853f8845e5e078384e71973bd74089f"
-  integrity sha512-XXUITwIkGb3CPJ2hforHah/zTINRyie5006Jd2HKy2qz7snEJXl0KLfsJZW/wst9g6R2rFvqba3VpNYdu1hDcA==
+prettier@^1.16.4:
+  version "1.16.4"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.16.4.tgz#73e37e73e018ad2db9c76742e2647e21790c9717"
+  integrity sha512-ZzWuos7TI5CKUeQAtFd6Zhm2s6EpAD/ZLApIhsF9pRvRtM1RFo61dM/4MSRUA0SuLugA/zgrZD8m0BaY46Og7g==
 
 pretty-error@^2.0.2:
   version "2.1.1"