Added travis config

.travis.yml

@@ -0,0 +1,44 @@
+sudo: false
+
+language: php
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+env:
+  global:
+    - COMPOSER_ARGS="--no-interaction"
+
+matrix: 
+  fast_finish: true
+  include:
+    - php: 7.1
+      env:
+        - EXECUTE_CS_CHECK=true 
+        - DEPS=lowest
+    - php: 7.1
+      env:
+        - DEPS=latest
+    - php: 7.2
+    - php: 7.3
+
+before_install:
+  - if [[ $EXECUTE_COVERAGE != 'true' ]]; then phpenv config-rm xdebug.ini || return 0 ; fi
+  - composer self-update
+  - chmod -R +rwX test/asset/data
+
+install:
+  - if [[ $DEPS == 'latest' ]]; then travis_retry composer update $COMPOSER_ARGS ; fi
+  - if [[ $DEPS == 'lowest' ]]; then travis_retry composer update --prefer-lowest --prefer-stable $COMPOSER_ARGS ; fi
+  - travis_retry composer install $COMPOSER_ARGS
+  - composer show --installed
+
+script:
+  - mkdir -p build/logs
+  - if [[ EXECUTE_COVERAGE == 'true' ]]; then ./vendor/bin/phpunit --coverage-clover build/logs/clover.xml ; fi
+  - if [[ EXECUTE_COVERAGE != 'true' ]]; then ./vendor/bin/phpunit ; fi
+  - if [[ $EXECUTE_CS_CHECK == 'true' ]]; then ./vendor/bin/phpcs; fi
+
+after_script:
+  - php vendor/bin/coveralls

composer.json

@@ -4,7 +4,8 @@
     "type": "library",
     "require-dev": {
         "phpunit/phpunit": "^7.5",
-        "api-skeletons/coding-standard": "^1.0"
+        "api-skeletons/coding-standard": "^1.0",
+        "php-coveralls/php-coveralls": "^2.1"
     },
     "license": "MIT",
     "authors": [