Stop testing on Postgres 9.4 (#7)

Author: orf

.travis.yml

@@ -14,8 +14,8 @@ env:
 # Quick Runs. Lowest supported database and Python version.
 - COMPOSE_APP=sqlite PYTHON_VERSION=3.6
 - COMPOSE_APP=sqlite-gis PYTHON_VERSION=3.6
-- COMPOSE_APP=postgres PYTHON_VERSION=3.6 POSTGRES_VERSION=9.4
-- COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=9.4 POSTGIS_VERSION=2.4
+- COMPOSE_APP=postgres PYTHON_VERSION=3.6 POSTGRES_VERSION=9.5
+- COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=9.5 POSTGIS_VERSION=2.4
 - COMPOSE_APP=mysql PYTHON_VERSION=3.6 MYSQL_VERSION=5.6
 - COMPOSE_APP=mysql-gis PYTHON_VERSION=3.6 MYSQL_VERSION=5.6
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.6 MARIADB_VERSION=10.1
@@ -32,19 +32,16 @@ env:
 - COMPOSE_APP=postgres PYTHON_VERSION=3.6 POSTGRES_VERSION=10
 - COMPOSE_APP=postgres PYTHON_VERSION=3.6 POSTGRES_VERSION=11
 
-- COMPOSE_APP=postgres PYTHON_VERSION=3.7 POSTGRES_VERSION=9.4
 - COMPOSE_APP=postgres PYTHON_VERSION=3.7 POSTGRES_VERSION=9.5
 - COMPOSE_APP=postgres PYTHON_VERSION=3.7 POSTGRES_VERSION=9.6
 - COMPOSE_APP=postgres PYTHON_VERSION=3.7 POSTGRES_VERSION=10
 - COMPOSE_APP=postgres PYTHON_VERSION=3.7 POSTGRES_VERSION=11
 
 # Postgres gis:
-- COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=9.5 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=9.6 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=10 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.6 POSTGRES_VERSION=11 POSTGIS_VERSION=2.5
 
-- COMPOSE_APP=postgres-gis PYTHON_VERSION=3.7 POSTGRES_VERSION=9.4 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.7 POSTGRES_VERSION=9.5 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.7 POSTGRES_VERSION=9.6 POSTGIS_VERSION=2.4
 - COMPOSE_APP=postgres-gis PYTHON_VERSION=3.7 POSTGRES_VERSION=10 POSTGIS_VERSION=2.4