add travis ci.

Author: leeqvip

.travis.yml

@@ -0,0 +1,24 @@
+language: php
+sudo: false
+
+php:
+  - 7.2
+  - 7.3
+
+services:
+  - mysql
+
+before_install:
+  - travis_retry composer self-update
+  - mysql -e 'create database if not exists casbin;'
+
+install:
+  - travis_retry composer install --no-suggest --no-interaction
+
+script:
+ - vendor/bin/phpunit --version
+ - mkdir -p build/logs
+ - vendor/bin/phpunit
+
+after_script:
+ - travis_retry vendor/bin/php-coveralls -v