Update prettier config and reformat

Here's the discussion summary:
- single quote, because that's what I'm used to in the JS world
- trailing comma, to avoid unnecessary git changes
- print-width 120, because 120 still doesn't require to scroll horizontally, and vertical space is precious

1 files changed, 9 insertions, 9 deletions

diff --git a/frontend/src/index.js b/frontend/src/index.js
index 5fd52c01..a627dd07 100644
--- a/frontend/src/index.js
+++ b/frontend/src/index.js
@@ -1,13 +1,13 @@
-import "babel-polyfill";
-import "./global-styles.css";
+import 'babel-polyfill';
+import './global-styles.css';
 
-import React from "react";
-import ReactDOM from "react-dom";
-import { Router } from "react-router";
-import { Provider } from "react-redux";
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { Router } from 'react-router';
+import { Provider } from 'react-redux';
 
-import configureStore from "./store";
-import { routes } from "./routes";
+import configureStore from './store';
+import { routes } from './routes';
 
 const initialState = {};
 const { store, history } = configureStore(initialState);
@@ -16,5 +16,5 @@ ReactDOM.render(
   <Provider store={store}>
     <Router history={history} routes={routes} />
   </Provider>,
-  document.getElementById("root")
+  document.getElementById('root')
 );