chore(release): 1.6.0 [skip ci]

# [1.6.0](1.5.0...1.6.0) (2020-07-27)

### Features

* **Query:** Allow non-string query attributes ([2de56cb](2de56cb))

Author: semantic-release-bot

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@ideal-postcodes/core-interface",
-  "version": "1.5.0",
+  "version": "1.6.0",
   "description": "Interface specification for javascript based API Clients to api.ideal-postcodes.co.uk",
   "author": {
     "name": "Ideal Postcodes",