Add prettier to be able to use .toMatchInlineSnapshot

Signed-off-by: Hung-Han (Henry) Chen <chenhungh@gmail.com>

package.json

@@ -357,6 +357,7 @@
     "postcss": "^8.3.6",
     "postcss-loader": "4.3.0",
     "postinstall-postinstall": "^2.1.0",
+    "prettier": "^2.4.1",
     "progress-bar-webpack-plugin": "^2.1.0",
     "randomcolor": "^0.6.2",
     "raw-loader": "^4.0.2",

yarn.lock

@@ -11302,6 +11302,11 @@ prepend-http@^2.0.0:
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
+prettier@^2.4.1:
+  version "2.4.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.1.tgz#671e11c89c14a4cfc876ce564106c4a6726c9f5c"
+  integrity sha512-9fbDAXSBcc6Bs1mZrDYb3XKzDLm4EXXL9sC1LqKP5rZkT6KRr/rf9amVUcODVXgguK/isJz0d0hP72WeaKWsvA==
+
 pretty-error@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/pretty-error/-/pretty-error-2.1.1.tgz#5f4f87c8f91e5ae3f3ba87ab4cf5e03b1a17f1a3"