upgrade react and material-ui to their latest versions

client/package.json

 {
   "name": "spot-web-app",
-    "version": "0.1.0",
+  "version": "0.1.1",
   "homepage": "http://spot.lrde.epita.fr/app/",
   "private": true,
   "license": "GPL-3.0",
   "dependencies": {
-        "@material-ui/core": "^1.4.3",
-        "react": "^16.4.2",
-        "react-dom": "^16.4.2",
-        "react-scripts": "1.1.4",
+    "@material-ui/core": "^3.1.2",
+    "react": "^16.5.2",
+    "react-dom": "^16.5.2",
+    "react-scripts": "2.0.3",
     "react-svg-inline": "^2.1.1",
     "typeface-roboto": "0.0.54"
   },
@@ -17,5 +17,11 @@
     "build": "react-scripts build",
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject"
-    }
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not ie <= 11",
+    "not op_mini all"
+  ]
 }