Prepare release v1.7.0 (#300)

Author: mtojek

versions/1/changelog.yml

@@ -2,11 +2,8 @@
 ## This file documents changes in the package specification. It is NOT a package specification file.
 ## Newer entries go at the bottom.
 ##
-- version: 1.6.1-next
+- version: 1.7.0
   changes:
-  - description: Prepare for next version
-    type: enhancement
-    link: https://github.com/elastic/package-spec/pull/295
   - description: Add kibana/osquery-pack-asset
     type: enhancement
     link: https://github.com/elastic/package-spec/pull/299