chore(release): Bump version to 4.3.0 [skip ci]

# [4.3.0](v4.2.3...v4.3.0) (2018-10-26)

### Features

* Add MediaUploader component ([#343](#343), [#342](#342)) ([f891b6f](f891b6f))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "harmonium",
-  "version": "4.2.3",
+  "version": "4.3.0",
   "description": "An opinionated React component framework for teams that move fast.",
   "repository": {
     "type": "git",