Add constant output so that users can quickly get all types

src/bowser.js

@@ -5,6 +5,12 @@
  * MIT License | (c) Denis Demchenko 2015-2017
  */
 import Parser from './parser.js';
+import {
+  BROWSER_MAP,
+  ENGINE_MAP,
+  OS_MAP,
+  PLATFORMS_MAP,
+} from './constants.js';
 
 /**
  * Bowser class.
@@ -47,4 +53,9 @@ class Bowser {
   }
 }
 
+Bowser.BROWSER_MAP = BROWSER_MAP;
+Bowser.ENGINE_MAP = ENGINE_MAP;
+Bowser.OS_MAP = OS_MAP;
+Bowser.PLATFORMS_MAP = PLATFORMS_MAP;
+
 export default Bowser;