Merge pull request #2 from open-source-contributions/test_enhancement

Improve Travis CI setting and Git ignore files

Author: nasrulhazim

.gitignore

@@ -1 +1,7 @@
-/vendor
+/vendor
+
+# PHPUnit
+.phpunit.result.cache
+
+# PHP CS Fixer
+.php_cs.cache

.travis.yml

@@ -2,6 +2,7 @@ language: php
 
 php:
   - 7.3
+  - 7.4
 
 before_script:
   - travis_retry composer install --prefer-dist --no-interaction
@@ -11,4 +12,4 @@ cache:
     - vendor
 
 script:
-  - vendor/bin/phpunit  --testdox --verbose
+  - vendor/bin/phpunit  --testdox --verbose