Add analytics

package.json

@@ -6,6 +6,7 @@
     "math-expression-evaluator": "^1.2.17",
     "react": "^16.4.1",
     "react-dom": "^16.4.1",
+    "react-ga": "^2.5.3",
     "react-scripts": "1.1.4",
     "styled-components": "^3.3.2"
   },

src/index.js

@@ -1,8 +1,12 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
+import ReactGA from 'react-ga';
 import './index.css';
 import App from './App';
 import registerServiceWorker from './registerServiceWorker';
 
+ReactGA.initialize('UA-1359868-17');
+ReactGA.pageview(window.location.pathname + window.location.search);
+
 ReactDOM.render(<App />, document.getElementById('root'));
 registerServiceWorker();

yarn.lock

@@ -5578,6 +5578,13 @@ react-error-overlay@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-4.0.0.tgz#d198408a85b4070937a98667f500c832f86bd5d4"
 
+react-ga@^2.5.3:
+  version "2.5.3"
+  resolved "https://registry.yarnpkg.com/react-ga/-/react-ga-2.5.3.tgz#0f447c73664c069a5fc341f6f431262e3d4c23c4"
+  optionalDependencies:
+    prop-types "^15.6.0"
+    react "^15.6.2 || ^16.0"
+
 react-is@^16.3.1:
   version "16.4.1"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.4.1.tgz#d624c4650d2c65dbd52c72622bbf389435d9776e"
@@ -5627,7 +5634,7 @@ react-scripts@1.1.4:
   optionalDependencies:
     fsevents "^1.1.3"
 
-react@^16.4.1:
+"react@^15.6.2 || ^16.0", react@^16.4.1:
   version "16.4.1"
   resolved "https://registry.yarnpkg.com/react/-/react-16.4.1.tgz#de51ba5764b5dbcd1f9079037b862bd26b82fe32"
   dependencies: