Remove 2 dead article links

#422

Author: kmoppel

README.md

@@ -329,8 +329,6 @@ for `EXPLAIN`, that also provides performance tips (Commercial Software).
 
 ### Articles
 
-* [What PostgreSQL has over other open source SQL databases: Part I](https://www.compose.com/articles/what-postgresql-has-over-other-open-source-sql-databases/)
-* [What PostgreSQL has over other open source SQL databases: Part II](https://www.compose.com/articles/what-postgresql-has-over-other-open-source-sql-databases-part-ii/)
 * [the ultimate postgres vs mysql blog post](https://di.nmfay.com/postgres-vs-mysql)
 * [Debugging PostgreSQL performance, the hard way](https://www.justwatch.com/blog/post/debugging-postgresql-performance-the-hard-way/)
 * [Why use Postgres?](http://www.craigkerstiens.com/2017/04/30/why-postgres-five-years-later/)