Updates dependencies

package.json

@@ -7,8 +7,8 @@
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.14.0",
     "gh-pages": "^2.0.1",
-    "react": "^16.8.6",
-    "react-dom": "^16.8.6",
+    "react": "^16.12.0",
+    "react-dom": "^16.12.0",
     "react-router-dom": "^5.1.2",
     "react-scripts": "^3.3.0",
     "react-test-renderer": "^16.8.6"
@@ -25,13 +25,22 @@
     "collectCoverageFrom": [
       "src/**/*.{js,jsx}",
       "!src/index.js",
-      "!src/registerServiceWorker.js"
+      "!src/serviceWorker.js"
     ]
   },
-  "browserslist": [
-    ">0.2%",
-    "not dead",
-    "not ie <= 11",
-    "not op_mini all"
-  ]
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  }
 }