Improved Pg test matrix (#616)

* Add postgres 10/11 to test  matrix
* Add docker-compose file fo running multiple postgres versions locally
* Fix client test for pg 10, modify function details to include specific fields
* Try to install latest postgres client
* Add concurrency setting

pkg/statements/sql/function.sql

@@ -1,5 +1,8 @@
 SELECT
-  p.*,
+  p.oid,
+  p.proname,
+  p.pronamespace,
+  p.proowner,
   pg_get_functiondef(oid) AS functiondef
 FROM
   pg_catalog.pg_proc p

pkg/statements/sql/objects.sql

@@ -40,7 +40,6 @@ WITH all_objects AS (
   WHERE
     n.nspname !~ '^pg_toast'
     AND n.nspname NOT IN ('information_schema', 'pg_catalog')
-    AND p.prokind = 'f'
 )
 SELECT * FROM all_objects
 ORDER BY 1, 2