Bump the minimum version of PostgreSQL to 9.3

https://www.postgresql.org/support/versioning/

- 9.1 EOLed on September 2016.
- 9.2 EOLed on September 2017.

9.3 is also not supported since Nov 8, 2018.  https://www.postgresql.org/about/news/1905/
I think it may be a little bit early to drop PostgreSQL 9.3 yet.

* Deprecated `supports_ranges?` since no other databases support range data type

* Add `supports_materialized_views?` to abstract adapter
Materialized views itself is supported by other databases, other connection adapters may support them

* Remove `with_manual_interventions`
It was only necessary for PostgreSQL 9.1 or earlier

* Drop CI against PostgreSQL 9.2

1 files changed, 2 insertions, 4 deletions

diff --git a/activerecord/test/cases/view_test.rb b/activerecord/test/cases/view_test.rb
index 88e5e4a421..36b9df7ba5 100644
--- a/activerecord/test/cases/view_test.rb
+++ b/activerecord/test/cases/view_test.rb
@@ -156,8 +156,7 @@ if ActiveRecord::Base.connection.supports_views?
   end
 
   # sqlite dose not support CREATE, INSERT, and DELETE for VIEW
-  if current_adapter?(:Mysql2Adapter, :SQLServerAdapter) ||
-      current_adapter?(:PostgreSQLAdapter) && ActiveRecord::Base.connection.postgresql_version >= 90300
+  if current_adapter?(:Mysql2Adapter, :SQLServerAdapter, :PostgreSQLAdapter)
 
     class UpdateableViewTest < ActiveRecord::TestCase
       self.use_transactional_tests = false
@@ -207,8 +206,7 @@ if ActiveRecord::Base.connection.supports_views?
   end # end of `if current_adapter?(:Mysql2Adapter, :PostgreSQLAdapter, :SQLServerAdapter)`
 end # end of `if ActiveRecord::Base.connection.supports_views?`
 
-if ActiveRecord::Base.connection.respond_to?(:supports_materialized_views?) &&
-    ActiveRecord::Base.connection.supports_materialized_views?
+if ActiveRecord::Base.connection.supports_materialized_views?
   class MaterializedViewTest < ActiveRecord::PostgreSQLTestCase
     include ViewBehavior