Added Devtool Prettier

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "jsxSingleQuote": true,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "jsxBracketSameLine": true,
+  "parser": "babel"
+}

package.json

@@ -17,6 +17,7 @@
   "private": false,
   "devDependencies": {
     "@babel/core": "^7.2.2",
+    "@babel/parser": "^7.3.2",
     "@babel/polyfill": "^7.2.5",
     "@babel/preset-env": "^7.2.3",
     "@babel/preset-react": "^7.0.0",
@@ -29,6 +30,7 @@
     "mocha": "^5.2.0",
     "node-sass": "^4.11.0",
     "npm-run-all": "^4.1.5",
+    "prettier": "^1.16.4",
     "sass-loader": "^7.1.0",
     "style-loader": "^0.23.1",
     "webpack": "^4.28.2",

yarn.lock

@@ -221,7 +221,7 @@
     esutils "^2.0.2"
     js-tokens "^4.0.0"
 
-"@babel/parser@^7.2.2", "@babel/parser@^7.2.3":
+"@babel/parser@^7.2.2", "@babel/parser@^7.2.3", "@babel/parser@^7.3.2":
   version "7.3.2"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.3.2.tgz#95cdeddfc3992a6ca2a1315191c1679ca32c55cd"
   integrity sha512-QzNUC2RO1gadg+fs21fi0Uu0OuGNzRKEmgCxoLNzbCdoprLwjfmZwzUrpUNfJPaVRwBpDY47A17yYEGWyRelnQ==
@@ -4579,6 +4579,11 @@ postcss@^7.0.5, postcss@^7.0.6:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+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-bytes@^1.0.2:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-1.0.4.tgz#0a22e8210609ad35542f8c8d5d2159aff0751c84"