Bump min version of PostgreSQL (#6443)

README.md

@@ -94,7 +94,7 @@ A more complete overview of our stack is available in
   the badge.
 - [Yarn](https://yarnpkg.com/) 1.x: please refer to their
   [installation guide](https://classic.yarnpkg.com/en/docs/install).
-- [PostgreSQL](https://www.postgresql.org/) 9.4 or higher.
+- [PostgreSQL](https://www.postgresql.org/) 9.5 or higher.
 - [ImageMagick](https://imagemagick.org/): please refer to ImageMagick's
   [installation instructions](https://imagemagick.org/script/download.php).
 - [Redis](https://redis.io/) 4 or higher.

docs/installation/linux.md

@@ -36,6 +36,8 @@ There are two ways to install Yarn.
 
 ### PostgreSQL
 
+DEV requires PostgreSQL version 9.5 or higher.
+
 1. Run
    `sudo apt update && sudo apt install postgresql postgresql-contrib libpq-dev`.
 1. To test the installation you can run `sudo -u postgres psql` which should
@@ -45,8 +47,7 @@ There are two ways to install Yarn.
 
 There are more than one ways to setup PostgreSQL. For additional configuration,
 check out our [PostgreSQL setup guide](/installation/postgresql) or the official
-[PostgreSQL](https://www.postgresql.org/) site for further information. DEV
-requires PostgreSQL version 9.4 or higher.
+[PostgreSQL](https://www.postgresql.org/) site for further information.
 
 ### ImageMagick
 

docs/installation/mac.md

@@ -20,10 +20,11 @@ Please refer to their [installation guide](https://yarnpkg.com/en/docs/install).
 
 ### PostgreSQL
 
-DEV requires PostgreSQL version 9.4 or higher. The easiest way to get started is
-to use [Postgres.app](https://postgresapp.com/). Alternatively, check out the
-official [PostgreSQL](https://www.postgresql.org/) site for more installation
-options.
+DEV requires PostgreSQL version 9.5 or higher.
+
+The easiest way to get started is to use
+[Postgres.app](https://postgresapp.com/). Alternatively, check out the official
+[PostgreSQL](https://www.postgresql.org/) site for more installation options.
 
 For additional configuration options, check our
 [PostgreSQL setup guide](/installation/postgresql).

docs/installation/windows.md

@@ -110,9 +110,11 @@ Make sure that Yarn is installed with `yarn -v`
 
 ### PostgreSQL
 
+DEV requires PostgreSQL version 9.5 or higher.
+
 If you don't have PostgreSQL installed on your Windows system, you can do so
 right now. WSL is able to connect to a PostgreSQL instance on your Windows
-machine. DEV requires PostgreSQL version 9.4 or higher.
+machine.
 
 Download [PostgreSQL for Windows](https://www.postgresql.org/download/windows/)
 and install it.