chore(release): Bump version to 4.0.1 [skip ci]

<a name="4.0.1"></a>
## [4.0.1](v4.0.0...v4.0.1) (2018-05-11)

### Bug Fixes

* Repair semantic release, change possum references ([6cf60d0](6cf60d0))

package.json

@@ -1,6 +1,6 @@
 {
   "name": "harmonium",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "An opinionated React component framework for teams that move fast.",
   "repository": {
     "type": "git",