Modernize imports and lifecycles (#304)

Author: charpeni

index.js

@@ -1,5 +1,5 @@
-const BlurView = require('./src/BlurView');
-const VibrancyView = require('./src/VibrancyView');
+import BlurView from './src/BlurView';
+import VibrancyView from './src/VibrancyView';
 
 module.exports = {
   BlurView: BlurView,

src/BlurView.android.js

@@ -14,7 +14,7 @@ const OVERLAY_COLORS = {
 };
 
 class BlurView extends Component {
-  componentWillMount() {
+  componentDidMount() {
     DeviceEventEmitter.addListener('ReactNativeBlurError', message => {
       throw new Error(`[ReactNativeBlur]: ${message}`);
     });