chore(release): 4.0.0 [skip ci]

# [4.0.0](3.0.0...4.0.0) (2020-06-25)

### chore

* **Node:** Drop Node 8, add 14 ([e7a0f43](e7a0f43))

### BREAKING CHANGES

* **Node:** Node 8 no longer supported

Author: semantic-release-bot

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "postcode",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "UK Postcode helper methods",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",