build: configures npm tag for publishing

Author: kyubisation

package.json

@@ -2,6 +2,9 @@
   "name": "angular-server-side-configuration",
   "version": "8.0.0-beta.0",
   "description": "Configure an angular application on the server",
+  "publishConfig": {
+    "tag": "next"
+  },
   "builders": "./builders/builders.json",
   "schematics": "./schematics/collection.json",
   "scripts": {