Bump prettier from 1.19.1 to 2.0.2 in /app

Bumps [prettier](https://github.com/prettier/prettier) from 1.19.1 to 2.0.2.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@1.19.1...2.0.2)

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

app/package.json

@@ -38,7 +38,7 @@
     "immutable": "4.0.0-rc.12",
     "jquery": "3.4.1",
     "popper.js": "1.16.1",
-    "prettier": "1.19.1",
+    "prettier": "2.0.2",
     "react": "16.13.1",
     "react-bootstrap": "1.0.0",
     "react-dom": "16.13.1",

app/yarn.lock

@@ -6402,10 +6402,10 @@ prettier-linter-helpers@^1.0.0:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@1.19.1:
-  version "1.19.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
-  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
+prettier@2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.0.2.tgz#1ba8f3eb92231e769b7fcd7cb73ae1b6b74ade08"
+  integrity sha512-5xJQIPT8BraI7ZnaDwSbu5zLrB6vvi8hVV58yHQ+QK64qrY40dULy0HSRlQ2/2IdzeBpjhDkqdcFBnFeDEMVdg==
 
 pretty-format@^25.1.0:
   version "25.1.0"