Stop testing on MariaDB 10.1.

Author: felixxm

.travis.yml

@@ -18,7 +18,7 @@ env:
 - 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
+- COMPOSE_APP=mariadb PYTHON_VERSION=3.6 MARIADB_VERSION=10.2
 
 # Sqlite
 - COMPOSE_APP=sqlite PYTHON_VERSION=3.7
@@ -84,16 +84,13 @@ env:
 - COMPOSE_APP=mysql-gis PYTHON_VERSION=3.8 MYSQL_VERSION=8.0
 
 # MariaDB:
-- COMPOSE_APP=mariadb PYTHON_VERSION=3.6 MARIADB_VERSION=10.2
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.6 MARIADB_VERSION=10.3
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.6 MARIADB_VERSION=10.4
 
-- COMPOSE_APP=mariadb PYTHON_VERSION=3.7 MARIADB_VERSION=10.1
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.7 MARIADB_VERSION=10.2
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.7 MARIADB_VERSION=10.3
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.7 MARIADB_VERSION=10.4
 
-- COMPOSE_APP=mariadb PYTHON_VERSION=3.8 MARIADB_VERSION=10.1
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.8 MARIADB_VERSION=10.2
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.8 MARIADB_VERSION=10.3
 - COMPOSE_APP=mariadb PYTHON_VERSION=3.8 MARIADB_VERSION=10.4