chore(package): bump version, write changelog

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Bowser Changelog
 
+### 2.9.0 (Jan 28, 2020)
+- [ADD] Export more methods and constants via .d.ts [#388], [#390]
+
 ### 2.8.1 (Dec 26, 2019)
 - [FIX] Reverted [#382] as it broke build
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bowser",
-  "version": "2.8.1",
+  "version": "2.9.0",
   "description": "Lightweight browser detector",
   "keywords": [
     "browser",