Add Travis configuration

Author: mglaman

.travis.yml

@@ -0,0 +1,19 @@
+language: php
+php:
+  - 7.1
+  - 7.2
+  - 7.3
+
+before_script:
+  - if php --ri xdebug >/dev/null; then phpenv config-rm xdebug.ini; fi
+before_install:
+  - composer self-update
+  - composer global require "hirak/prestissimo:^0.3"
+install:
+  - composer install --no-interaction
+script:
+  - ./vendor/bin/phpcs src
+  - ./vendor/bin/phpstan analyze src
+cache:
+  directories:
+    - $HOME/.composer/cache

README.md

@@ -1,5 +1,7 @@
 # phpstan-drupal
 
+[![Build Status](https://travis-ci.com/mglaman/phpstan-drupal.svg?branch=master)](https://travis-ci.com/mglaman/phpstan-drupal)
+
 Extension for PHPStan to allow analysis of Drupal code.
 
 ## Usage