feat(constants): add bot as a platform (#540)

README.md

@@ -149,7 +149,7 @@ list of aliases can be found in [the file](src/constants.js).
 
 ### Code Contributors
 
-This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+This project exists thanks to all the people who contribute. [[Contribute](.github/CONTRIBUTING.md)].
 <a href="https://github.com/lancedikson/bowser/graphs/contributors"><img src="https://opencollective.com/bowser/contributors.svg?width=890&button=false" /></a>
 
 ### Financial Contributors

src/constants.js

@@ -88,6 +88,7 @@ export const PLATFORMS_MAP = {
   mobile: 'mobile',
   desktop: 'desktop',
   tv: 'tv',
+  bot: 'bot',
 };
 
 export const OS_MAP = {

src/parser-platforms.js

@@ -12,7 +12,7 @@ export default [
     test: [/googlebot/i],
     describe() {
       return {
-        type: 'bot',
+        type: PLATFORMS_MAP.bot,
         vendor: 'Google',
       };
     },