Document EFCore.PG 10 as released (#441)

Author: roji

conceptual/EFCore.PG/release-notes/10.0.md

@@ -1,6 +1,6 @@
 # 10.0 Release Notes
 
-Npgsql.EntityFrameworkCore.PostgreSQL version 10.0 is now in development, preview versions are available on [nuget.org](https://www.nuget.org/packages/Npgsql.EntityFrameworkCore.PostgreSQL).
+Npgsql.EntityFrameworkCore.PostgreSQL version 10.0 is out and available on [nuget.org](https://www.nuget.org/packages/Npgsql.EntityFrameworkCore.PostgreSQL).
 
 ## Full support for EF 10 JSON complex types
 

conceptual/EFCore.PG/toc.yml

@@ -2,7 +2,7 @@
   href: index.md
 - name: Release notes
   items:
-  - name: "10.0 (rc)"
+  - name: "10.0"
     href: release-notes/10.0.md
   - name: "9.0"
     href: release-notes/9.0.md