docker added to test env

.travis.yml

@@ -1,14 +1,23 @@
+sudo: required
+
+services:
+- docker
+
 language: php
 
 php:
-  - '7.0'
-  - '7.1'
-  - '7.2'
-  - nightly
+- '7.0'
+- '7.1'
+- '7.2'
+- nightly
 
 before_script:
-  - composer self-update
-  - composer install --prefer-source --no-interaction --dev
+- docker pull evilfreelancer/docker-routeros
+- docker run -d -p 22:22 -p 8728:8728 -p 8729:8729 -ti evilfreelancer/docker-routeros
+- docker ps -a
+- sleep 30
+- composer self-update
+- composer install --prefer-source --no-interaction --dev
 
 script:
-  - vendor/bin/phpunit
+- vendor/bin/phpunit