new: Added changelog for API 4.0.8

This is shipping 11/5/18

Author: Dorthu

content/changelog/2018/11-05-api.md

@@ -0,0 +1,14 @@
+---
+title: "4.0.8: 2018-11-05"
+date: "2018-11-05T00:00:00-12:00"
+description: "API Changelog 4.0.8"
+changelog:
+- API
+version: 4.0.8
+---
+### Added:
+
+ * Added 'tags' to Domains
+   * The Domain object now includes "tags", an array of strings
+   * POST /domains now accepts "tags", an array of strings
+   * GET /tags/:tag now returns tagged Domains in addition to Linodes