Add travis

Author: PasanBhanu

.travis.yml

@@ -0,0 +1,16 @@
+language: php
+
+php:
+  - 7.2
+  - 7.3
+
+env:
+  matrix:
+    - COMPOSER_FLAGS=""
+
+before_script:
+  - travis_retry composer self-update
+  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
+
+script:
+  - php vendor/bin/phpunit --coverage-text