Update README

Author: eemeli

README.md

@@ -1,35 +1,33 @@
 # Property Resource Bundle Loader for Webpack
 
-Loads .properties files into JavaScript as precompiled functions using
-[dot-properties] and [messageformat].
+Loads .properties files into JavaScript as precompiled functions using [dot-properties] and [messageformat].
 
-Property values are parsed directly as ICU MessageFormat. With the default
-options, will assume that the filename has `_` separated parts, of which the
-second is the two- or three-letter language code [as in Java Resource Bundles](https://docs.oracle.com/javase/9/docs/api/java/util/ResourceBundle.html#getBundle-java.lang.String-java.util.Locale-java.lang.ClassLoader-)
+Property values are parsed directly as ICU MessageFormat. With the default options, will assume that the filename has `_` separated parts, of which the second is the two- or three-letter language code [as in Java Resource Bundles].
 
 [dot-properties]: https://www.npmjs.com/package/dot-properties
 [messageformat]: https://messageformat.github.io/
+[as in Java Resource Bundles]: https://docs.oracle.com/javase/9/docs/api/java/util/ResourceBundle.html#getBundle-java.lang.String-java.util.Locale-java.lang.ClassLoader-
 
 ## Installation
 
 ```sh
-npm install messageformat messageformat-properties-loader
+npm install messageformat@next messageformat-properties-loader
 ```
 
+Starting from version 0.4.0, the loader requires messageformat v3, currently in beta.
+
 
 ## Usage
 
-For a working demo of the following, run `npm install` in the
-[`example/`](./example/) directory, and then open `example/dist/index.html` in
-a browser.
+For a working demo of the following, run `npm install && npm run build` in the [`example/`](./example/) directory, and then open `example/dist/index.html` in a browser.
 
 
 #### Webpack configuration
 
 ```js
 {
   test: /\.properties$/,
-  loader: require.resolve('messageformat-properties-loader'),
+  loader: 'messageformat-properties-loader',
   options: {
     biDiSupport: false,  // enables bi-directional text support
     defaultLocale: 'en', // used if resolution from filename fails
@@ -43,32 +41,27 @@ a browser.
 }
 ```
 
-Default option values are shown above, though none is required.
+Default option values are shown above, though none are required.
 
 
 #### messages_en.properties
 
 ```
-errors.format: {0} {1}
-errors.messages.confirmation: doesn't match {attribute}
-errors.messages.accepted: must be accepted
-errors.messages.wrong_length: is the wrong length (should be {count, plural, one{1 character} other{# characters}})
-errors.messages.equal_to: must be equal to {count}
+errors.confirmation: {src} doesn't match {attribute}
+errors.accepted: {src} must be accepted
+errors.wrong_length: {src} is the wrong length (should be {count, plural, one{1 character} other{# characters}})
+errors.equal_to: {src} must be equal to {count}
 ```
 
 
 #### example.js
 
 ```js
 import messages from './messages_en.properties'
-const { format, messages: errors } = messages.errors
 
-errors.accepted()
-// 'must be accepted'
+messages.errors.accepted({ src: 'Terms' })
+// 'Terms must be accepted'
 
-format([
-  'Your message',
-  errors.wrong_length({ count: 42 })
-])
-// 'Your message is the wrong length (should be 42 characters)'
+messages.errors.wrong_length({ src: 'Foo', count: 42 })
+// 'Foo is the wrong length (should be 42 characters)'
 ```