Updated PostgreSQL, more info in .env.template

Docker/.env.template

@@ -17,7 +17,8 @@ DJANGO_DB_USR=
 # scram-sha-256 hash. to generate a hash for a
 # password, set up a mock-up PostgreSQL database,
 # set encryption to scram-sha-256 and create a
-# user with DJANGO_DB_USR and DJANGO_DB_CLR_PW.
+# user with DJANGO_DB_USR and DJANGO_DB_CLR_PW by `psql`:
+# `CREATE USER <DJANGO_DB_USR> WITH PASSWORD '<DJANGO_DB_CLR_PW>';`
 # Then run
 # `select usename,passwd from PG_SHADOW;`.
 DJANGO_DB_PW=

Docker/postgres/Dockerfile

-FROM postgres:11.4-alpine
+FROM postgres:11.7-alpine
 
 # For more information check https://hub.docker.com/_/postgres and
 # https://docs.docker.com/samples/library/postgres/