Bump prettier from 1.11.1 to 1.18.2 (#57)

Bumps [prettier](https://github.com/prettier/prettier) from 1.11.1 to 1.18.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@1.11.1...1.18.2)

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

Author: dependabot-preview[bot]

package.json

@@ -45,7 +45,7 @@
     "eslint-config-1stg": "^3.1.0",
     "jest": "^22.4.2",
     "jsdoc": "^3.6.2",
-    "prettier": "^1.11.1",
+    "prettier": "^1.18.2",
     "rollup": "^1.16.6",
     "rollup-plugin-buble": "^0.19.8",
     "rollup-watch": "^4.3.1"

yarn.lock

@@ -3513,9 +3513,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-prettier@^1.11.1:
-  version "1.11.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.11.1.tgz#61e43fc4cd44e68f2b0dfc2c38cd4bb0fccdcc75"
+prettier@^1.18.2:
+  version "1.18.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
 
 pretty-format@^22.4.0:
   version "22.4.0"