Merge pull request #23 from citusdata/pg_11_enable

Readme update for PG 11

Author: furkansahin

README.md

@@ -144,7 +144,7 @@ Takes the union of both `JSONB`s and returns a new `JSONB`.
 Sets the number of counters to be tracked in a `JSONB`. If at some point, the current number of counters exceed `topn.number_of_counters` * 3, the list is pruned. The default value is 1000 for `topn.number_of_counters`. When you increase this setting, `TopN` uses more space and provides more accurate estimates.
 
 # Compatibility
-`TopN` is compatible with PostgreSQL 9.5, 9.6, and 10 releases. `TopN` is also compatible with all supported Citus releases, including Citus 6.x and 7.x. If you need to run `TopN` on a different version of PostgreSQL or Citus, please open an issue. Opening a pull request (PR) is also highly appreciated.
+`TopN` is compatible with PostgreSQL 9.6, and 10, 11 releases. `TopN` is also compatible with all supported Citus releases, including Citus 6.x and 7.x. If you need to run `TopN` on a different version of PostgreSQL or Citus, please open an issue. Opening a pull request (PR) is also highly appreciated.
 
 # Attributions
 The `TopN` extension to Postgres is developed and maintained by the Citus Data team. Citus Data's flagship product, the [Citus](https://github.com/citusdata/citus) distributed database, is an open source extension that distributes Postgres across many machines.