Bump prettier from 1.17.0 to 1.18.2 in /frontend

Bumps [prettier](https://github.com/prettier/prettier) from 1.17.0 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@1.17.0...1.18.2)

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

Author: dependabot-preview[bot]

frontend/package.json

@@ -43,7 +43,7 @@
     "eslint-plugin-react": "^7.12.4",
     "jest-fetch-mock": "^2.1.2",
     "node-localstorage": "^1.3.1",
-    "prettier": "^1.17.0",
+    "prettier": "^1.18.2",
     "react-test-renderer": "^16.8.6",
     "whatwg-url": "^7.0.0"
   },

frontend/yarn.lock

@@ -8449,10 +8449,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^1.17.0:
-  version "1.17.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
-  integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
+prettier@^1.18.2:
+  version "1.18.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
+  integrity sha512-OeHeMc0JhFE9idD4ZdtNibzY0+TPHSpSSb9h8FqtP+YnoZZ1sl8Vc9b1sasjfymH3SonAF4QcA2+mzHPhMvIiw==
 
 pretty-bytes@^4.0.2:
   version "4.0.2"